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* The casting of Creator/EricStoltz influenced the casting of several other roles. Creator/LeaThompson was chosen as the female lead in part because she had previously worked with Stoltz in ''Film/TheWildLife''. A key factor in Creator/ThomasFWilson's casting as Biff is that, at 6'3", he was one of the few contenders for the role who had some height on the 6' Stoltz. This also allowed for Creator/MeloraHardin, at 5'5", to be cast as his LoveInterest Jennifer, only for her to be let go when he was replaced with the 5'4" Creator/MichaelJFox.

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* The casting of Creator/EricStoltz influenced the casting of several other roles. Creator/LeaThompson was chosen as the female lead in part because she had previously worked with Stoltz in ''Film/TheWildLife''. A key factor in Creator/ThomasFWilson's casting as Biff is that, at 6'3", he was one of the few contenders for the role who had some height on the 6' Stoltz. This also allowed for Creator/MeloraHardin, at 5'5", to be cast as his LoveInterest {{Love Interest|s}} Jennifer, only for her to be let go when he was replaced with the 5'4" Creator/MichaelJFox.
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* UsefulNotes/RonaldReagan as the 1885 Mayor. Given the moment dropping his name in ''Part I'' and the ''Series/MaxHeadroom'' {{Expy}} that appears in the 80s Cafe in ''Part II'', having him appear in ''Part III'' would have neatly tied things together in a RuleOfCool way. And ''Part III'' was TheWestern, a genre Reagan worked with.

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* UsefulNotes/RonaldReagan Zemeckis and Gale considered having UsefulNotes/RonaldReagan, who recently left office as President, appear as the 1885 Mayor. Given the moment dropping his name in ''Part I'' and the ''Series/MaxHeadroom'' {{Expy}} that appears in the 80s Cafe in ''Part II'', having him appear in ''Part III'' would have neatly tied things together in a RuleOfCool way. And ''Part III'' was TheWestern, a genre Reagan worked with. Ultimately nothing came of it.
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* The sequel originally had Doc and Marty going back to the '60s after Biff's interference and seeing Marty's parents as pseudo-hippies, and part of his goal would have been to ensure that he is conceived. About mid-way through writing this part, they realized that there was nothing really stopping them from revisiting the events of the first movie. In that version, George was already dead in 2015 (and it was NOT 2015-A). It was mentioned that, at some undisclosed moment, George's life had been saved at a hospital that had previously survived an attempt from the town to demolish it. In the timeline where Biff became wealthy, the hospital had been demolished. You can read about this version and its associated tropes [[Script/NumberTwo on this very Wiki]].

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* The sequel originally had Doc and Marty going back to the '60s after Biff's interference and seeing Marty's parents as pseudo-hippies, and part of his goal would have been to ensure that he is conceived. About mid-way through writing this part, they realized that there was nothing really stopping them from revisiting the events of the first movie. Relatedly, the almanac plot, rather than being the main source of conflict is dealt with pretty quickly and is more of an excuse to get them to go back to the past, where the conflict one again shifts to Marty trying to guarantee his own existence. In that version, George was already dead in 2015 (and it was NOT 2015-A). It was mentioned that, at some undisclosed moment, George's life had been saved at a hospital that had previously survived an attempt from the town to demolish it. In the timeline where Biff became wealthy, the hospital had been demolished.demolished and George succumbed to his injuries, meaning that Biff was only indirectly responsible for his death, unlike in the final film where he directly murdered him. You can read about this version and its associated tropes [[Script/NumberTwo on this very Wiki]].
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** The casting of Creator/EricStoltz influenced the casting of several other roles. Creator/LeaThompson was chosen as the female lead in part because she had previously worked with Stoltz in ''Film/TheWildLife''. A key factor in Creator/ThomasFWilson's casting as Biff is that, at 6'3", he was one of the few contenders for the role who had some height on the 6' Stoltz. This also allowed for Creator/MeloraHardin, at 5'5", to be cast as his LoveInterest Jennifer, only for her to be let go when he was replaced with the 5'4" Creator/MichaelJFox.

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** * The casting of Creator/EricStoltz influenced the casting of several other roles. Creator/LeaThompson was chosen as the female lead in part because she had previously worked with Stoltz in ''Film/TheWildLife''. A key factor in Creator/ThomasFWilson's casting as Biff is that, at 6'3", he was one of the few contenders for the role who had some height on the 6' Stoltz. This also allowed for Creator/MeloraHardin, at 5'5", to be cast as his LoveInterest Jennifer, only for her to be let go when he was replaced with the 5'4" Creator/MichaelJFox.

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** Stoltz's casting influenced the casting of several other roles. Creator/LeaThompson was chosen as the female lead in part because she had previously worked with Stoltz in ''Film/TheWildLife''. A key factor in Creator/ThomasFWilson's casting as Biff is that, at 6'3", he was one of the few contenders for the role who had some height on the 6' Stoltz. This also allowed for Creator/MeloraHardin, at 5'5", to be cast as his LoveInterest Jennifer, only for her to be let go when he was replaced with the 5'4" Creator/MichaelJFox.



* Creator/TimRobbins, Creator/DanielStern, Creator/VincentDOnofrio, Creator/PeterDeluise and Creator/BillyZane read for the role of Biff Tannen before the casting of Creator/ThomasFWilson. Zane was ultimately cast as Biff's hechman Match.

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* Creator/TimRobbins, Creator/DanielStern, Creator/VincentDOnofrio, Creator/PeterDeluise and Creator/BillyZane read for the role of Biff Tannen before the casting of Creator/ThomasFWilson. Zane was ultimately cast as Biff's hechman Match.hechman, Match, in the first movie.
** The casting of Creator/EricStoltz influenced the casting of several other roles. Creator/LeaThompson was chosen as the female lead in part because she had previously worked with Stoltz in ''Film/TheWildLife''. A key factor in Creator/ThomasFWilson's casting as Biff is that, at 6'3", he was one of the few contenders for the role who had some height on the 6' Stoltz. This also allowed for Creator/MeloraHardin, at 5'5", to be cast as his LoveInterest Jennifer, only for her to be let go when he was replaced with the 5'4" Creator/MichaelJFox.
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Added DiffLines:

* Zemeckis and Gale intended--and fought for--III to have the same Universal logo as the previous two, for the sake of symmetry. Universal, however, wanted it to carry the 75th Anniversary banner.
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* In the original draft, Marty's interference in the past results in his time becoming more advanced upon his return.

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* In the original draft, Marty's draft's ending, Marty discovers upon his return home that his interference in the past results has culminated in his time becoming a much more advanced upon his return.world, which he tells Doc Brown (called Professor Brown in this draft) he's going to like.
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* In the original draft, Marty's interference in the past results in his time becoming more advanced upon his return.
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Added DiffLines:

** Stoltz's casting influenced the casting of several other roles. Creator/LeaThompson was chosen as the female lead in part because she had previously worked with Stoltz in ''Film/TheWildLife''. A key factor in Creator/ThomasFWilson's casting as Biff is that, at 6'3", he was one of the few contenders for the role who had some height on the 6' Stoltz. This also allowed for Creator/MeloraHardin, at 5'5", to be cast as his LoveInterest Jennifer, only for her to be let go when he was replaced with the 5'4" Creator/MichaelJFox.

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* There was originally going to be an explanation as to why Marty and Doc were friends: Doc just showed up one day and hired Marty to clean his garage, paying him $50 a week and free beer.

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* There was originally going to be an explanation as to why Marty and Doc were friends: Doc just showed up one day and hired Marty to clean his garage, paying him $50 a week and free beer.beer (Bob Gale would later add that it was Marty who, as a rebel kid, first heard of Doc being an outcast and sneaked into his garage out of curiosity).
* Doc had bankrupted himself funding his research (something only vaguely implied in the final film) and he made bootleg movie videos that Marty sold to other kids to scrap some money.



* Doc was originally called "Professor".

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* Doc was originally called "Professor"."Professor Brown".
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* Creator/TimRobbins, Creator/DanielStern, Creator/VincentDOnofrio, Creator/PeterDeluise and Creator/BillyZane read for the role of Biff Tannen before the casting of Creator/ThomasFWilson. Zane would eventually go on to portray Skinhead in the movie.

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* Creator/TimRobbins, Creator/DanielStern, Creator/VincentDOnofrio, Creator/PeterDeluise and Creator/BillyZane read for the role of Biff Tannen before the casting of Creator/ThomasFWilson. Zane would eventually go on to portray Skinhead in the movie.was ultimately cast as Biff's hechman Match.
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* Yet another version of the script had the time circuits damaged after the car was shot while fleeing from corrupt cops in 1985-A ([[OrphanedReference the ones Biff claimed to own]]).

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* Creator/EricStoltz was originally cast as Marty [=McFly=]. While Creator/MichaelJFox was always the first choice for the role, the production team behind ''Series/FamilyTies'' didn't want him absent from the series during Creator/MeredithBaxter's pregnancy. After six weeks of filming, Creator/RobertZemeckis and [[Film/Interstate60 Bob Gale]] decided that Stoltz was too much of a dramatic actor for a more comedic part. By this stage, Baxter was back fully on the series and the producers finally agreed to let Fox go off to star in the film.
** Creator/CThomasHowell was both Robert Zemeckis and Bob Gale's preferred choice for Marty, but the studio executives at Creator/{{Universal}} preferred Stoltz, which ultimately led to his casting.
** Creator/JonCryer, Creator/BenStiller, Creator/JohnCusack, Creator/JohnnyDepp, Creator/CharlieSheen, Creator/GeorgeNewbern, Creator/RalphMacchio, Creator/MatthewModine, and Creator/RobertDowneyJr also auditioned for Marty.
* Creator/JohnLithgow was the first choice to play Doc Brown, but he turned down the offer due to filming conflicts with ''Film/TwilightZoneTheMovie''.
** Creator/JeffGoldblum, Creator/JamesWoods, Creator/JohnCleese, Creator/JohnCandy, Creator/ChevyChase, Creator/SteveMartin, Creator/GeneWilder, Creator/EddieMurphy, Creator/GeneHackman, Creator/HaroldRamis, Creator/MandyPatinkin, Creator/HenryWinkler, Creator/DudleyMoore, Creator/RandyQuaid, Creator/RonSilver, Creator/JoePiscopo, Creator/RobinWilliams, Creator/MichaelKeaton, and Creator/DannyDeVito were also considered for Doc.
* Creator/TimRobbins, Creator/DanielStern, Creator/VincentDOnofrio, Creator/PeterDeluise, and Creator/BillyZane read for Biff Tannen before Creator/ThomasFWilson was cast. Zane would eventually go on to portray Skinhead in the movie.

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* Creator/EricStoltz was originally cast as Marty [=McFly=]. [=McFly=] before the casting of Creator/MichaelJFox. While Creator/MichaelJFox Fox was always the first choice for the role, the production team behind ''Series/FamilyTies'' didn't want him absent from the series during Creator/MeredithBaxter's pregnancy. After six weeks of filming, Creator/RobertZemeckis and [[Film/Interstate60 Bob Gale]] decided that Stoltz was too much of a dramatic actor for a more comedic part. By this stage, Baxter was back fully on the series and the producers finally agreed to let Fox go off to star in the film.
** Creator/CThomasHowell was the runner-up for the role of Marty [=McFly=]. Howell was both Robert Zemeckis and Bob Gale's preferred choice for Marty, the part, but the studio executives at Creator/{{Universal}} preferred Stoltz, which ultimately led to his casting.
casting.
** Creator/JonCryer, Creator/BenStiller, Creator/JohnCusack, Creator/JohnnyDepp, Creator/CharlieSheen, Creator/GeorgeNewbern, Creator/RalphMacchio, Creator/MatthewModine, Creator/MatthewModine and Creator/RobertDowneyJr also auditioned for Marty.
Marty [=McFly=] as well before the casting of Fox.
* Creator/JohnLithgow was the first choice to play for the role of Doc Brown, but he Brown before Creator/ChristopherLloyd was cast. However, Lithgow turned down the offer due to filming conflicts with ''Film/TwilightZoneTheMovie''.
** Creator/JeffGoldblum, Creator/JamesWoods, Creator/JohnCleese, Creator/JohnCandy, Creator/ChevyChase, Creator/SteveMartin, Creator/GeneWilder, Creator/EddieMurphy, Creator/GeneHackman, Creator/HaroldRamis, Creator/MandyPatinkin, Creator/HenryWinkler, Creator/DudleyMoore, Creator/RandyQuaid, Creator/RonSilver, Creator/JoePiscopo, Creator/RobinWilliams, Creator/MichaelKeaton, Creator/MichaelKeaton and Creator/DannyDeVito were also considered for Doc.
the part of Doc Brown before the casting of Lloyd.
* Creator/TimRobbins, Creator/DanielStern, Creator/VincentDOnofrio, Creator/PeterDeluise, Creator/PeterDeluise and Creator/BillyZane read for the role of Biff Tannen before Creator/ThomasFWilson was cast. the casting of Creator/ThomasFWilson. Zane would eventually go on to portray Skinhead in the movie.movie.
* Creator/RobertZemeckis and [[Film/Interstate60 Bob Gale]] originally pitched the film to Creator/{{Disney}} and then to Creator/ColumbiaPictures, both of whom turned it down, albeit for completely different reasons: Columbia felt it was too quaint whereas Disney thought it was too ''raunchy''. In particular, they took umbrage with the angle of 1955 Lorraine coming onto her future son.
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Even further rewrite


** Creator/CThomasHowell was the runner-up for Marty. Howell was both Robert Zemeckis and Bob Gale's preferred choice for the part, but the studio executives at Creator/{{Universal}} preferred Stoltz, which ultimately led to his casting.
** Creator/JonCryer, Creator/BenStiller, Creator/JohnCusack, Creator/JohnnyDepp, Creator/CharlieSheen, Creator/GeorgeNewbern, Creator/RalphMacchio, Creator/MatthewModine, and Creator/RobertDowneyJr auditioned for Marty [=McFly=] as well before the casting of Fox.

to:

** Creator/CThomasHowell was the runner-up for Marty. Howell was both Robert Zemeckis and Bob Gale's preferred choice for the part, Marty, but the studio executives at Creator/{{Universal}} preferred Stoltz, which ultimately led to his casting.
** Creator/JonCryer, Creator/BenStiller, Creator/JohnCusack, Creator/JohnnyDepp, Creator/CharlieSheen, Creator/GeorgeNewbern, Creator/RalphMacchio, Creator/MatthewModine, and Creator/RobertDowneyJr also auditioned for Marty [=McFly=] as well before the casting of Fox. Marty.
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Corrected oversight.


* Creator/JohnLithgow was the first choice for Doc Brown, Lithgow turned down the offer due to filming conflicts with ''Film/TwilightZoneTheMovie''.

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* Creator/JohnLithgow was the first choice for to play Doc Brown, Lithgow but he turned down the offer due to filming conflicts with ''Film/TwilightZoneTheMovie''.
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Revised entries.


* Creator/EricStoltz was originally cast as Marty [=McFly=] before the casting of Creator/MichaelJFox. While Fox was always the first choice for the role, the production team behind ''Series/FamilyTies'' didn't want him absent from the series during Creator/MeredithBaxter's pregnancy. After six weeks of filming, Creator/RobertZemeckis and [[Film/Interstate60 Bob Gale]] decided that Stoltz was too much of a dramatic actor for a more comedic part. By this stage, Baxter was back fully on the series and the producers finally agreed to let Fox go off to star in the film.
** Creator/CThomasHowell was the runner-up for the role of Marty [=McFly=]. Howell was both Robert Zemeckis and Bob Gale's preferred choice for the part, but the studio executives at Creator/{{Universal}} preferred Stoltz, which ultimately led to his casting.

to:

* Creator/EricStoltz was originally cast as Marty [=McFly=] before the casting of Creator/MichaelJFox. [=McFly=]. While Fox Creator/MichaelJFox was always the first choice for the role, the production team behind ''Series/FamilyTies'' didn't want him absent from the series during Creator/MeredithBaxter's pregnancy. After six weeks of filming, Creator/RobertZemeckis and [[Film/Interstate60 Bob Gale]] decided that Stoltz was too much of a dramatic actor for a more comedic part. By this stage, Baxter was back fully on the series and the producers finally agreed to let Fox go off to star in the film.
** Creator/CThomasHowell was the runner-up for the role of Marty [=McFly=].Marty. Howell was both Robert Zemeckis and Bob Gale's preferred choice for the part, but the studio executives at Creator/{{Universal}} preferred Stoltz, which ultimately led to his casting.



* Creator/JohnLithgow was the first choice for the role of Doc Brown before Creator/ChristopherLloyd was cast. However, Lithgow turned down the offer due to filming conflicts with ''Film/TwilightZoneTheMovie''.
** Creator/JeffGoldblum, Creator/JamesWoods, Creator/JohnCleese, Creator/JohnCandy, Creator/ChevyChase, Creator/SteveMartin, Creator/GeneWilder, Creator/EddieMurphy, Creator/GeneHackman, Creator/HaroldRamis, Creator/MandyPatinkin, Creator/HenryWinkler, Creator/DudleyMoore, Creator/RandyQuaid, Creator/RonSilver, Creator/JoePiscopo, Creator/RobinWilliams, Creator/MichaelKeaton, and Creator/DannyDeVito were also considered for the part of Doc Brown before the casting of Lloyd.
* Creator/TimRobbins, Creator/DanielStern, Creator/VincentDOnofrio, Creator/PeterDeluise, and Creator/BillyZane read for the role of Biff Tannen before the casting of Creator/ThomasFWilson. Zane would eventually go on to portray Skinhead in the movie.

to:

* Creator/JohnLithgow was the first choice for the role of Doc Brown before Creator/ChristopherLloyd was cast. However, Brown, Lithgow turned down the offer due to filming conflicts with ''Film/TwilightZoneTheMovie''.
** Creator/JeffGoldblum, Creator/JamesWoods, Creator/JohnCleese, Creator/JohnCandy, Creator/ChevyChase, Creator/SteveMartin, Creator/GeneWilder, Creator/EddieMurphy, Creator/GeneHackman, Creator/HaroldRamis, Creator/MandyPatinkin, Creator/HenryWinkler, Creator/DudleyMoore, Creator/RandyQuaid, Creator/RonSilver, Creator/JoePiscopo, Creator/RobinWilliams, Creator/MichaelKeaton, and Creator/DannyDeVito were also considered for the part of Doc Brown before the casting of Lloyd.
Doc.
* Creator/TimRobbins, Creator/DanielStern, Creator/VincentDOnofrio, Creator/PeterDeluise, and Creator/BillyZane read for the role of Biff Tannen before the casting of Creator/ThomasFWilson.Creator/ThomasFWilson was cast. Zane would eventually go on to portray Skinhead in the movie.
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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/bttfcon.png]]
[[caption-width-right:350:Instead of the iconic [=DeLorean=] powered by plutonium, it was meant to be a refrigerator powered by Coca-Cola.]]

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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/bttfcon.png]]
[[caption-width-right:350:Instead
org/pmwiki/pub/images/7c3f9477_bab1_4fd3_a07a_acc707d5b090.jpeg]]
[[caption-width-right:350: Production shot
of Creator/EricStoltz, the iconic [=DeLorean=] powered by plutonium, it was meant to be a refrigerator powered by Coca-Cola.]]
original Marty [=McFly=]]]
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* Creator/JohnLithgow was the first choice for the role of Doc Brown before Creator/ChristopherLloyd was cast. However, Lithgow turned down the offer due to scheduling conflicts with ''Film/TwilightZoneTheMovie''.

to:

* Creator/JohnLithgow was the first choice for the role of Doc Brown before Creator/ChristopherLloyd was cast. However, Lithgow turned down the offer due to scheduling filming conflicts with ''Film/TwilightZoneTheMovie''.
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** Creator/JonCryer, Creator/BenStiller, Creator/JohnCusack, Creator/JohnnyDepp, Creator/CharlieSheen, Creator/GeorgeNewbern, Creator/RalphMacchio, Creator/MatthewModine, and Creator/RobertDowneyJr auditioned for the role of Marty [=McFly=] as well before the casting of Fox.
* Creator/JohnLithgow was the first choice for Doc Brown before Creator/ChristopherLloyd was cast. However, Lithgow turned down the offer due to scheduling conflicts with ''Film/TwilightZoneTheMovie''.
** Creator/JeffGoldblum, Creator/JamesWoods, Creator/JohnCleese, Creator/JohnCandy, Creator/ChevyChase, Creator/SteveMartin, Creator/GeneWilder, Creator/EddieMurphy, Creator/GeneHackman, Creator/MandyPatinkin, Creator/HenryWinkler, Creator/DudleyMoore, Creator/RandyQuaid, Creator/RonSilver, Creator/JoePiscopo, Creator/RobinWilliams, Creator/MichaelKeaton, and Creator/DannyDeVito were also considered for the part of Doc Brown before the casting of Lloyd.

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** Creator/JonCryer, Creator/BenStiller, Creator/JohnCusack, Creator/JohnnyDepp, Creator/CharlieSheen, Creator/GeorgeNewbern, Creator/RalphMacchio, Creator/MatthewModine, and Creator/RobertDowneyJr auditioned for the role of Marty [=McFly=] as well before the casting of Fox.
* Creator/JohnLithgow was the first choice for the role of Doc Brown before Creator/ChristopherLloyd was cast. However, Lithgow turned down the offer due to scheduling conflicts with ''Film/TwilightZoneTheMovie''.
** Creator/JeffGoldblum, Creator/JamesWoods, Creator/JohnCleese, Creator/JohnCandy, Creator/ChevyChase, Creator/SteveMartin, Creator/GeneWilder, Creator/EddieMurphy, Creator/GeneHackman, Creator/HaroldRamis, Creator/MandyPatinkin, Creator/HenryWinkler, Creator/DudleyMoore, Creator/RandyQuaid, Creator/RonSilver, Creator/JoePiscopo, Creator/RobinWilliams, Creator/MichaelKeaton, and Creator/DannyDeVito were also considered for the part of Doc Brown before the casting of Lloyd.

Changed: 2083

Removed: 204

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[[caption-width-right:350:Instead of the iconic [=DeLorean=] powered by plutonium it was meant to be a Refrigerator powered by Pepsi. In fact [[Film/IndianaJonesAndTheKingdomOfTheCrystalSkull I bet it could protect someone in a nuclear explosion]].]]

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[[caption-width-right:350:Instead of the iconic [=DeLorean=] powered by plutonium plutonium, it was meant to be a Refrigerator refrigerator powered by Pepsi. In fact [[Film/IndianaJonesAndTheKingdomOfTheCrystalSkull I bet it could protect someone in a nuclear explosion]].Coca-Cola.]]



* Most famously, Creator/EricStoltz was originally cast as Marty [=McFly=] before Creator/MichaelJFox. While Fox was always the first choice for the role, the production team behind ''Series/FamilyTies'' didn't want him absent from the series during Creator/MeredithBaxter's pregnancy. After six weeks of filming, Creator/RobertZemeckis and [[Film/Interstate60 Bob Gale]] decided that Stoltz was too much of a dramatic actor for a more comedic part. By this stage, Baxter was back fully on the series and the producers finally agreed to let Fox go off to star in the film.
** The other secondary choice for Marty aside from Stoltz was Creator/CThomasHowell. Howell was actually Zemeckis and Gale's preferred choice, but the studio executives preferred Stoltz so he got the role. Had Howell been cast, there is a good chance Fox would've never been hired to replace him as Howell had more experience in comedy.
** Creator/JohnCusack, Creator/JohnnyDepp, Creator/RobertDowneyJr, Creator/RalphMacchio, Creator/MatthewModine and Creator/GeorgeNewbern also auditioned for Marty. When asked about Depp's audition, Bob Gale responded with this.
---> '''Gale:''' Geez, I don't even remember that we read Johnny Depp! So whatever he did, it wasn't all that memorable, I guess!
* Creator/JohnLithgow was the first choice for Doc Brown. However, Lithgow turned down the offer due to scheduling commitments to ''Film/TwilightZoneTheMovie''.
** Creator/JeffGoldblum, Creator/JamesWoods, Creator/JohnCleese, Creator/JohnCandy, Creator/ChevyChase, Creator/SteveMartin, Creator/GeneWilder, Creator/EddieMurphy, Creator/GeneHackman, Creator/HenryWinkler, Creator/DudleyMoore, Creator/RandyQuaid, Creator/JoePiscopo, Creator/RobinWilliams, Creator/MichaelKeaton, and Creator/DannyDeVito were considered for Doc Brown as well.
* Creator/TimRobbins, Creator/DanielStern, and Creator/VincentDOnofrio were considered for the role of Biff Tannen before Creator/ThomasFWilson was cast.
* Creator/KyraSedgwick was considered for Jennifer.

to:

* Most famously, Creator/EricStoltz was originally cast as Marty [=McFly=] before the casting of Creator/MichaelJFox. While Fox was always the first choice for the role, the production team behind ''Series/FamilyTies'' didn't want him absent from the series during Creator/MeredithBaxter's pregnancy. After six weeks of filming, Creator/RobertZemeckis and [[Film/Interstate60 Bob Gale]] decided that Stoltz was too much of a dramatic actor for a more comedic part. By this stage, Baxter was back fully on the series and the producers finally agreed to let Fox go off to star in the film.
** The other secondary choice Creator/CThomasHowell was the runner-up for the role of Marty aside from Stoltz was Creator/CThomasHowell. [=McFly=]. Howell was actually both Robert Zemeckis and Bob Gale's preferred choice, choice for the part, but the studio executives at Creator/{{Universal}} preferred Stoltz so he got the role. Had Howell been cast, there is a good chance Fox would've never been hired Stoltz, which ultimately led to replace him as Howell had more experience in comedy.
his casting.
** Creator/JonCryer, Creator/BenStiller, Creator/JohnCusack, Creator/JohnnyDepp, Creator/RobertDowneyJr, Creator/CharlieSheen, Creator/GeorgeNewbern, Creator/RalphMacchio, Creator/MatthewModine Creator/MatthewModine, and Creator/GeorgeNewbern also Creator/RobertDowneyJr auditioned for Marty. When asked about Depp's audition, Bob Gale responded with this.
---> '''Gale:''' Geez, I don't even remember that we read Johnny Depp! So whatever he did, it wasn't all that memorable, I guess!
the role of Marty [=McFly=] as well before the casting of Fox.
* Creator/JohnLithgow was the first choice for Doc Brown. Brown before Creator/ChristopherLloyd was cast. However, Lithgow turned down the offer due to scheduling commitments to conflicts with ''Film/TwilightZoneTheMovie''.
** Creator/JeffGoldblum, Creator/JamesWoods, Creator/JohnCleese, Creator/JohnCandy, Creator/ChevyChase, Creator/SteveMartin, Creator/GeneWilder, Creator/EddieMurphy, Creator/GeneHackman, Creator/MandyPatinkin, Creator/HenryWinkler, Creator/DudleyMoore, Creator/RandyQuaid, Creator/RonSilver, Creator/JoePiscopo, Creator/RobinWilliams, Creator/MichaelKeaton, and Creator/DannyDeVito were also considered for the part of Doc Brown as well.
before the casting of Lloyd.
* Creator/TimRobbins, Creator/DanielStern, Creator/VincentDOnofrio, Creator/PeterDeluise, and Creator/VincentDOnofrio were considered Creator/BillyZane read for the role of Biff Tannen before Creator/ThomasFWilson was cast.
* Creator/KyraSedgwick was considered for Jennifer.
the casting of Creator/ThomasFWilson. Zane would eventually go on to portray Skinhead in the movie.



* Creator/JonCryer and Creator/BenStiller auditioned for the role of Marty in [[https://io9.gizmodo.com/jon-cryer-and-ben-stiller-auditioned-for-a-very-differe-1844544821 a very different version]]. In this draft, a more generic time machine and the aforementioned fridge. However, the time machine required [[BizarreBeverageUse a special ingredient to work]]: ''Coca-Cola.'' In the finale, Marty sneaks into a nuclear testing site, complete with detailed suburban houses. As the countdown starts, he drops the bottle of Coke, and it shatters on the floor. He panics at first, until he realizes that like any American home in that era, the fridge is stocked with another bottle of Coke. It's also lead-lined, so hiding in there lets him survive the blast. This conveniently gives Marty everything he needs to go back to the future. Also, Marty played the ''Film/CloseEncountersOfTheThirdKind'' theme on his guitar while pirating a VHS copy of it in the opening scene.

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* Creator/JonCryer and Creator/BenStiller auditioned for In one draft of the role of Marty in [[https://io9.gizmodo.com/jon-cryer-and-ben-stiller-auditioned-for-a-very-differe-1844544821 a very different version]]. In this draft, script, a more generic time machine and the aforementioned fridge.fridge above were utilized. However, the time machine required [[BizarreBeverageUse a special ingredient to work]]: ''Coca-Cola.'' In the finale, Marty sneaks into a nuclear testing site, complete with detailed suburban houses. As the countdown starts, he drops the bottle of Coke, and it shatters on the floor. He panics at first, until he realizes that like any American home in that era, the fridge is stocked with another bottle of Coke. It's also lead-lined, so hiding in there lets him survive the blast. This conveniently gives Marty everything he needs to go back to the future. Also, Marty played the ''Film/CloseEncountersOfTheThirdKind'' theme on his guitar while pirating a VHS copy of it in the opening scene.
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[[caption-width-right:350:Insted of the iconic [=DeLorean=] powered by plutonium it was meant to be a Refrigerator powered by Pepsi. In fact [[Film/IndianaJonesAndTheKingdomOfTheCrystalSkull I bet it could protect someone in a nuclear explosion]].]]

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[[caption-width-right:350:Insted [[caption-width-right:350:Instead of the iconic [=DeLorean=] powered by plutonium it was meant to be a Refrigerator powered by Pepsi. In fact [[Film/IndianaJonesAndTheKingdomOfTheCrystalSkull I bet it could protect someone in a nuclear explosion]].]]
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[[caption-width-right:350:Insted of the iconic [=DeLorean=] powered by plutonium it was meant to be a Refrigerator powered by Pepsi. In fact [[Film/IndianaJonesAndTheKingdomOfTheCrystalSkull I bet it could service a nuclear explosion]]]]

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[[caption-width-right:350:Insted of the iconic [=DeLorean=] powered by plutonium it was meant to be a Refrigerator powered by Pepsi. In fact [[Film/IndianaJonesAndTheKingdomOfTheCrystalSkull I bet it could service protect someone in a nuclear explosion]]]]
explosion]].]]
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[[caption-width-right:350:Insted of the iconic [=DeLorean=] powered by plutonium it was meant to be a Refrigerator powered by Pepsi.]]

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[[caption-width-right:350:Insted of the iconic [=DeLorean=] powered by plutonium it was meant to be a Refrigerator powered by Pepsi.]]
In fact [[Film/IndianaJonesAndTheKingdomOfTheCrystalSkull I bet it could service a nuclear explosion]]]]
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[[caption-width-right:350:Insted of the iconic DeLorean powered by plutonium it was meant to be a Refrigerator powered by Pepsi.]]

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[[caption-width-right:350:Insted of the iconic DeLorean [=DeLorean=] powered by plutonium it was meant to be a Refrigerator powered by Pepsi.]]
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[[caption-width-right:350:Insted of the iconic DeLorean powered by plutonium it was meant to be a Refrigerator powered by Pepsi.]]

[[folder:Part 1]]
* Most famously, Creator/EricStoltz was originally cast as Marty [=McFly=] before Creator/MichaelJFox. While Fox was always the first choice for the role, the production team behind ''Series/FamilyTies'' didn't want him absent from the series during Creator/MeredithBaxter's pregnancy. After six weeks of filming, Creator/RobertZemeckis and [[Film/Interstate60 Bob Gale]] decided that Stoltz was too much of a dramatic actor for a more comedic part. By this stage, Baxter was back fully on the series and the producers finally agreed to let Fox go off to star in the film.
** The other secondary choice for Marty aside from Stoltz was Creator/CThomasHowell. Howell was actually Zemeckis and Gale's preferred choice, but the studio executives preferred Stoltz so he got the role. Had Howell been cast, there is a good chance Fox would've never been hired to replace him as Howell had more experience in comedy.
** Creator/JohnCusack, Creator/JohnnyDepp, Creator/RobertDowneyJr, Creator/RalphMacchio, Creator/MatthewModine and Creator/GeorgeNewbern also auditioned for Marty. When asked about Depp's audition, Bob Gale responded with this.
---> '''Gale:''' Geez, I don't even remember that we read Johnny Depp! So whatever he did, it wasn't all that memorable, I guess!
* Creator/JohnLithgow was the first choice for Doc Brown. However, Lithgow turned down the offer due to scheduling commitments to ''Film/TwilightZoneTheMovie''.
** Creator/JeffGoldblum, Creator/JamesWoods, Creator/JohnCleese, Creator/JohnCandy, Creator/ChevyChase, Creator/SteveMartin, Creator/GeneWilder, Creator/EddieMurphy, Creator/GeneHackman, Creator/HenryWinkler, Creator/DudleyMoore, Creator/RandyQuaid, Creator/JoePiscopo, Creator/RobinWilliams, Creator/MichaelKeaton, and Creator/DannyDeVito were considered for Doc Brown as well.
* Creator/TimRobbins, Creator/DanielStern, and Creator/VincentDOnofrio were considered for the role of Biff Tannen before Creator/ThomasFWilson was cast.
* Creator/KyraSedgwick was considered for Jennifer.
* The original time machine was a modified refrigerator, changed because it would have been a very stationary prop and Creator/StevenSpielberg had images of children locking themselves in the fridge to the horror of their parents[[note]]For younger readers who don't understand how someone could become trapped in a refrigerator, they used to be held closed with a physical catch that could only be opened by a handle on the outside, and these older models were still somewhat plentiful at the time of the film. Modern ones all use magnets to hold themselves closed, with no catches.Though, many local laws regarding fridge disposal still require doors to be removed, even magnetic catch ones, due to not being amended since the time of locking fridge doors[[/note]] (humorously, he would later use a refrigerator and a nuclear explosion in ''Film/IndianaJonesAndTheKingdomOfTheCrystalSkull''). They also would have driven into the blast of a nuclear bomb to fuel the flux capacitor, changed because that alone would have doubled the production costs and the clock tower lightning strike made a fairly simple and stationary location.
* Creator/JonCryer and Creator/BenStiller auditioned for the role of Marty in [[https://io9.gizmodo.com/jon-cryer-and-ben-stiller-auditioned-for-a-very-differe-1844544821 a very different version]]. In this draft, a more generic time machine and the aforementioned fridge. However, the time machine required [[BizarreBeverageUse a special ingredient to work]]: ''Coca-Cola.'' In the finale, Marty sneaks into a nuclear testing site, complete with detailed suburban houses. As the countdown starts, he drops the bottle of Coke, and it shatters on the floor. He panics at first, until he realizes that like any American home in that era, the fridge is stocked with another bottle of Coke. It's also lead-lined, so hiding in there lets him survive the blast. This conveniently gives Marty everything he needs to go back to the future. Also, Marty played the ''Film/CloseEncountersOfTheThirdKind'' theme on his guitar while pirating a VHS copy of it in the opening scene.
* One version of the script had Biff as a cop that kept "borrowing" stuff from George and had a daughter. After Marty changed the past, Biff became a security guard working for George, who became a boxing champion.
* The producers considered using "Papa Loves Mambo" by Perry Como when Marty arrives in the 1955 Hill Valley, before deciding on "Mister Sandman", thereby making it the MisterSandmanSequence. "Papa Loves Mambo" would however show up in ''Part II'' where it's the song playing on the car radio as Biff drives to the dance..
* There was originally going to be an explanation as to why Marty and Doc were friends: Doc just showed up one day and hired Marty to clean his garage, paying him $50 a week and free beer.
* Originally when Marty looked Doc up in the past, Doc was going to be having a party, and was flanked by two women when he opened the door. The scene played out the same, but with Doc's two girlfriends laughing at Marty. Then, instead of getting the idea for time travel from falling down while hanging a clock, Doc was inspired after whispering something into a woman's ear and subsequently being hit in the head with a beer bottle.
* In the original treatment, the time machine was rigged up inside a car wash. Marty [=McFly=] was chronically depressed, and in a hilarious misunderstanding, he mistook the time machine for a suicide device and climbed into it in order to kill himself. Also, there was originally going to be a major plot point where people in the past repeatedly mistook Marty for an alien.
* The studio wanted Zemeckis to cut the "Johnny B. Goode" scene to improve pacing, but relented because the test audiences considered it one of the best parts of the movie.
* Doc was originally called "Professor".
* As indicated in the novelization, there were once as many as six Libyan terrorists, including a DarkActionGirl named Uranda. The leader was named Sam, who started out as a ChildSoldier (he's in his early forties in 1985 and mentioned to have been a terrorist for 30 years).
* In the scenes shot with Eric Stoltz, Marty was dressed in a black jacket and pants with a white t-shirt, with the idea being that it'd be something a teen in 1985 might wear that, while appearing contemporary, conveniently wouldn't stand out much in 1955. Once Michael J. Fox took over the role, it was decided it would add to the FishOutOfTemporalWater comedy if his clothing ''didn't'' fit in for 1955, leading to Marty getting a more distinctly 1980s look.
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[[folder:Part 2]]
* According to Bob Gale, ideas proposed for ''Part II'' included a visit to Doc's family (with Christopher Lloyd playing his mother), and going to the days of Prohibition when Biff's ancestor was a bootlegger. The last bit was retaken for the first episode of the [[VideoGame/BackToTheFutureTheGame video game]]. And yes, Bob Gale worked on it.
* The sequel originally had Doc and Marty going back to the '60s after Biff's interference and seeing Marty's parents as pseudo-hippies, and part of his goal would have been to ensure that he is conceived. About mid-way through writing this part, they realized that there was nothing really stopping them from revisiting the events of the first movie. In that version, George was already dead in 2015 (and it was NOT 2015-A). It was mentioned that, at some undisclosed moment, George's life had been saved at a hospital that had previously survived an attempt from the town to demolish it. In the timeline where Biff became wealthy, the hospital had been demolished. You can read about this version and its associated tropes [[Script/NumberTwo on this very Wiki]].
* The sequel was originally a {{deconstruction}} of the first movie. Future Marty is a wreck because he's addicted to taking chances and trying to cheat his way to fortune. When the present day Marty discovers that he will turn out poor, he decides to secure his own financial future by buying the Sports Almanac. Even after seeing what kind of damage careless time travel can do in 1985-A, Marty still finds it hard to let go of the Almanac. Ultimately, the lesson he learns is that the best way to get a good future is to live a good life. Major parts of the story remain in the final movie, but the {{Aesop}} got muddled in rewrites.
* There is an entire subplot missing from the 1955 segment, which explains the problems with the time circuits which lead to Doc getting sent back to 1885. Originally Doc ran into farmer Peabody and a policeman who were looking for the "UFO" that crashed into Peabody's barn and killed his pine. Later on Peabody sees the [=DeLorean=] flying by, and shoots at it with his rifle, hitting its underside and damaging the time circuits. In the finished movie this was changed so that the problem was actually caused by old Biff hitting the console with the head of his cane as he's getting out of the [=DeLorean=]. Doc makes an attempt to fix it, but the problem reoccurs after he accidentally hits the line of pennants on top of the Lyon Estates sign as he's flying off. According to WordOfGod the story was changed because they were (for some unknown reason) unable to shoot at the Lyon Estates sign set during the day. This is also why Marty gets stuck in Biff's garage for 12 hours.
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[[folder:Part 3]]
* In the first draft, while fixing up the [=DeLorean=], Marty learns that Doc is a physics professor at the Hill Valley University and is dating the Dean's daughter Jill Wooster. Doc says that she also likes Jules Verne and they both went to Pismo Beach. Dean Wooster and his cohorts Cooper and Mintz suddenly show up and tells Doc that he must participate in one of three projects: the Edsel car, chemical warfare, or Xerox (which Doc pronounces "X-rox"). Doc however has no interest in any of the projects and refuses to do so. The Dean threatens Doc's relationship with his daughter unless he cooperates. The next day, Jill tries to convince Doc to do it for her, but Doc still refuses. Jill angrily breaks up with him, adding that she never liked Jules Verne. Heartbroken, Doc trashes all his photos of himself with Jill, and swore to never fall in love again (that is until he meets Clara).
* In the scene where Marty flips the spittoon onto Buford, he was ''originally'' supposed to have flipped some stray manure. However, stunt coordinator Walter Scott, who actually had grown up in the rural areas of the west, and actually moved his family out there, pointed out to the Bobs that in the old west, people frequently got covered in manure all the time and never complained at all, a fact that the Bobs, two self-professed city guys, never knew. Ironically enough, when the Bobs settled on the spittoon, Scott reacted akin to "oh that's ''nasty!''"
* UsefulNotes/RonaldReagan as the 1885 Mayor. Given the moment dropping his name in ''Part I'' and the ''Series/MaxHeadroom'' {{Expy}} that appears in the 80s Cafe in ''Part II'', having him appear in ''Part III'' would have neatly tied things together in a RuleOfCool way. And ''Part III'' was TheWestern, a genre Reagan worked with.
* If Creator/CrispinGlover had signed on to the sequels (various reasons have circulated over the years as to why), he would've played Seamus [=McFly=] in ''Part III'', and Creator/LeaThompson would play a bar girl who eventually marries Seamus. Also, Seamus offers Mad Dog a job after losing to Marty.
* In the script, a heartbroken Doc drank the whole bottle. Looks like he ''can'' hold his liquor... until Marty comes to get him.
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