History SeriesContinuityError / LiveActionTV

* In a flashback in ''Series/{{Forever|2014}}'', Abe gladly goes to fight in Vietnam, but a later episode shows a photo from his days as a student protester.

** Upon being reunited with Arya, [[spoiler: Sandor Clegane]] angrily says "you left me to die". Sure FromACertainPointOfView but actually [[spoiler: he was left weakened after a duel with Brienne and thought Arya would finish him off, since he was on her list of people to kill. Arya in fact refused to kill him and walked off, despite him ''begging'' for her to kill him]].

* In a flashback in ''Series/{{Forever}}'', Abe gladly goes to fight in Vietnam, but a later episode shows a photo from his days as a student protester.

* In season one of ''Series/BoyMeetsWorld'', Mr. Feeny informs his students that they will be the high school class of 2000. The characters actually graduate five seasons later, in 1998.
** both Shawn and Topanga used to have a sister in earlier seasons that mysteriously disappeared.

** There are inconsistencies on when Brennan's parents disappeared, with her indicating she was young at one point and saying she didn't have very many memories of them, and later being said to be 15. The time of year they left changed too.

** The Mobile Unit seeks to destroy the sundial even though Olando previously stated that destroying it would bring a massive timetastrophe that could possibly alter the universe for the worse. Even Olando himself is on board with the idea — and he's definitely not regarded as an agent with a bad memory.
** Olando is a recognized and respected figure by both Logan the Ogre and Wanda the Wizardess, although they only recognize him for one feat. Although it's justified since Wanda and Logan could both have the ability to live for a long time and we never hear about Olando's life prior to becoming an Odd Squad Protector, the Mobile Unit and their RoguesGallery just learned of his existence not too long ago, and it seems quite farfetched that Wanda and Logan, of all people, would know about him and his brave deed.
** A Featherite is among the group of villains who plan to break into the Big Office. In the Featherites' debut episode, they were introduced as being, at best, on neutral and friendly terms with Odd Squad, and filling the role of an ambassador of sorts to the organization.

*** The names of departments. Creature Care is referred to simply as "Creatures", the Food and Beverage department is referred to as "Kitchen Services", the Task Force department is referred to as "Internal Investigations" [[note]]It was also referred to as such in the ''Odd Squad Agent's Handbook'', but that is considered LooseCanon[[note]], Maintenance/Transportation is just referred to as "Tube Lobby Operators" with no mention of the Maintenance side, and Athletics and Conflict Resolution is just referred to as "Athletics" while dropping the Conflict Resolution part of the department entirely.

** According to ''Series/ICarly2021'' episode "IM Cursed", Carly's birthday is on July 24th. "iGot a Hot Room" showed her in school on her birthday. Most American public schools let out for summer vacation in late May or early-to-mid June and don't resume until August or September. This is partially due to a {{retcon}}, as Carly's birthday was previously on January 14th (as listed on iCarly.com) and the date was later changed to take place closer to the airdate of "iGot a Hot Room".

* ''Series/TheDickVanDykeShow'': Mel is consistently described as Alan Brady's brother-in-law; however, sometimes he's said to be married to Alan's sister, and other times Alan is said to be married to Mel's sister. (Of course, it's possible [[DoubleInLawMarriage both are true]], though that strange scenario wouldn't be our first assumption, and the question would become why it's never brought up.)

* ''Series/TheDickVanDykeShow'': Mel is consistently described as Alan Brady's brother-in-law; however, sometimes he's said to be married to Alan's sister, and other times Alan is said to be married to Mel's sister. (Of course, it's possible [[DoubleInLawMarriage both are true]], though then the question becomes why that didn't come up.)

* ''Series/TheDickVanDykeShow'': Mel is always described as Alan Brady's brother-in-law; however, sometimes he's said to be married to Alan's sister, and other times Alan is said to be married to Mel's sister. (Of course, it's possible [[DoubleInLawMarriage both are true]], though then the question becomes why that didn't come up.)

** In ''Cheers'', Frasier said he had no siblings. The first episode of ''Frasier'' he meets Niles at the coffee shop and they agree to start talking again. [[FridgeBrilliance Seems like it's just a Crane family tradition]] — have a fight, pretend someone doesn't exist until reconciliation.

** When the Trill were first introduced in a ''TNG'' episode they were very different than when they became regular ''[=DS9=]'' characters. To start with, they had facial ridges and no spots unlike their ''[=DS9=]'' appearance.[[note]]The change was made because they hired model Terry Farrell to play Dax, and didn't want her to lose any of her FanService appeal[[/note]] The symbiotic nature of the Trill was also different, implied this is the natural state of the entire species, rather than only certain Trill being selected as hosts, and it's implied that the host contributes little or nothing with the symbiont being the "true" Trill, whereas Jadzia Dax made it clear each host creates a completely different individual when joined, ''and'' that joined Trill are a small minority, with the vast majority of Trill never getting a symbiont. Lastly, the Trill are stated by Picard to be a relatively unknown species, to the point that their symbiotic nature was a total shock. ''[=DS9=]'' established that at least one joined Trill -- the previous Dax host -- was a famous Federation ambassador and Starfleet officer who had been Sisko's mentor for most of his career. Even if he was the only Trill ever to serve in Starfleet at that point, they should have had at least some basic awareness of the species. In addition, it's a major plot point in Season 7 of ''[=DS9=]'' that Ezri had to become the permanent Dax host, even though she never wanted/intended to be Joined, because she was the only Trill onboard, and that was supposedly the only option when Dax could no longer survive outside a host. But ''TNG'' had already established that a non-Trill can act as a temporary host (which Trills can't do, because their bodies will fully integrate with the symbiont within a day or so) with no long-term ill effects. Why not just put Dax in a willing non-Trill volunteer (or even a series of them, if necessary) until they got to the Trill homeworld?

* ''Series/SesameStreet'': Episode 4059 has Curly Bear eating a banana. In a later episode, Baby Bear says she never ate a banana before.

*** Within ''Big Bang'', season one suggested that George Cooper had only recently passed away (Missy brings documents from George's estate for Sheldon to sign and when Mary seduces Dr. Gablehauser to get Sheldon his job back, Mary says George has been dead "long enough" implying it wasn't really that long) but later episodes established that Sheldon was 14 when his father died, over a decade before the first season. George is also described posthumously as being an abusive, idiotic, misogynistic, drunken redneck whose constant fighting with Mary traumatized Sheldon to the point where he cannot stand to hear arguing of any kind. ''Young Sheldon'' portrays George as your average BumblingDad who treats his family well despite the occasional petty squabble.

* ''Series/TheOddCouple'' did multiple episodes showing how Felix and Oscar "first met." Also, one episode establishes that one of them didn't have any wedding photos; in another episode, he is seen looking at his wedding photos.

** [[Recap/DoctorWhoS38E3Orphan55 "Orphan 55"]]: Graham (and the audience) see the writing on the sign in the tunnel as [[spoiler:Cyrillic]], requiring the Doctor to translate. However, it had been previously established that the TARDIS' psychic translation covers [[Recap/DoctorWhoS30E2TheFiresOfPompeii writing]] and [[spoiler:[[Recap/DoctorWhoS33E8ColdWar Russian]]]], so Graham should have been able to read the sign in the Latin alphabet (which wouldn't have been too much of a problem plot-wise, since the sign has [[spoiler:the name of a well-known Russian city]] written on it). The other possible explanation is that the translation circuits weren't working at their distance from the TARDIS (since the fam was teleported directly to Orphan 55 from the console room), but that would require everyone else at Tranquillity Spa to already be speaking English since the companions have no trouble communicating.

* ''Aliens in America'' has an episode about Justin's fear of performing in public — it's a plot point that he's a weak singer who freezes up so badly on stage that he wasn't allowed to sing in a school pageant that offered a role to anyone who showed up. A few episodes later, Justin's been a soloist in the school choir for years.

* ''Series/{{Victorious}}'': In the episode "The Breakfast Bunch", Tori says she's never had detention before. However, she got two weeks of detention in the season one episode "Stage Fighting".