Adored by the Network: Along with The Fairly OddParents! and SpongeBob SquarePants (which only airs late at night/wee hours in the morning anyways), this is easily one of the most aired shows on Nicktoons. At one point, it took up five hours of the schedule despite being over a decade old. Even when it does get removed, it always finds its way back on the schedule.
Accidentally-Correct Writing: Despite coasting along on Rule of Cool, the show sometimes got something right even when the writers obviously weren't even aiming for accuracy. One such highlight occured in "Sorry, Wrong Era" when Jimmy shattered the big diamond in an attempt to break off a chunk small enough for his jury-rigged Bamboo Technology time-warping device. Diamond, while certainly the hardest natural substance on earth, is also brittle enough to shatter using little more than a hammer, chisel, and a little bit of precision (at least the gem-grade quality stuff that goes in jewelry. Dull bort diamonds are much harder to crack).
The Character Ice Cream Bar: Popsicle released an ice of Jimmy's face. It has blue gumball eyes and is cherry cola flavored. The ice has been discontinued.
In the Mexican Spanish dub, Isabel Martiñón as Carl; averted for Jimmy (Eduardo Curiel in season 1, Diego Ángeles afterwards), Nick (Enzo Fortuny), and Mrs. Wheezer (Magda Giner).
The game for Attack Of The Twonkies uses Cindy's design from the movie instead of her older looking, pigtail-less design from the actual series. Same with Nicktoons Unite!
There is a toy of Jimmy wearing his red-and-white shirt from the Runaway Rocketboy short.
He Also Did: Mark DeCarlo, voice of Hugh Neutron, was a lot winner on the 1980s NBC run of Sale of the Century, hosted the relationship game show Studs in the early 90s, and currently appears on ABC's The Chew.
Kids' Meal Toy: In 2002, Burger King released a set of five different pieces of Jimmy's rocket that could connect to each other, each one featuring at least one of the show's characters. These consisted of Jimmy, Goddard, Cindy, Carl, and Sheen and Libby together.
Life Imitates Art: "Retroville 9", aired 2003, shows Jimmy & Co. going to Nagoya, Japan to participate in the "Junior Baseball World Championships". No such tournament existed back then but a 12U Baseball World Cup was founded in 2011, with a 15U equivalent coming up the following year. Seeing as that was a Season 2 episode, Jimmy and others would have qualified for the former. Japan being the tournament's host also makes sense as baseball is a very popular sport there.
Missing Episode: Amazon and iTunes do not have "When Pants Attack", or "Party At Neutron's/Ultra Sheen", both likely due to music clearance issues (as one of Aaron Carter's songs from the movie is played briefly in "Pants", and some less clear issues in the case of "Party"). Hulu did not have those two, nor "Holly Jolly Jimmy" or "The Egg-pire Strikes Back". All of the episodes missing from Hulu resurfaced when the series was put onto CBS All Access. However, when the service rebranded to Paramount+, all missing episodes besides "Egg-pire" were removed again. These episodes would later be included with Shout! Factory's Complete Series DVD release in 2021, albeit with the music on "Party" changed and the background music from Hugh's Pule song from “Holly Jolly Jimmy” missing. "Holly Jolly Jimmy" has since been added to Paramount+, with the music intact.
The Original Darrin: King Goobot and Ooblar were voiced by S. Scott Bullock and Paul Greenberg in the original pilot. Patrick Stewart and Martin Short replaced them for the movie, but Bullock and Greenberg reprised their roles for the series.
In the 2002 video game, King Goobot and Ooblar were voiced by Joe Whyte and Mark DeCarlo respectively.
Ultra-Lord was voiced by Jim Cummings in the film and series but was voiced by Rob Paulsen in the 2001 PC video game.
The mayor of Retroville was voiced by Mark DeCarlo in the episode "Normal Boy" and by Jim Cummings in all subsequent appearances.
Tee of the alien bandit trio was originally voiced by Maurice LaMarche, who also voiced Zix, but Kevin Michael Richardson started voicing the character in "The Incredible Shrinking Town" and onward.
Sheen's dad went from being voiced by Carlos Alazraqui in the movie to being voiced by Joe Lala in the series.
In the Mexican Spanish dub, Jimmy was voiced by Eduardo Curiel in the movie and in the first season, and by Diego Ángeles for the rest of the series.
The Brazilian dub of the series did manage to retain most of the movie's cast, with a few exceptions being Mônica Rossi as Jimmy's mother Judy (who was replaced by Juraciara Diácovo), Paulo Flores as King Goobot (replaced by Jorge Vasconcellos)note Flores had passed away just a month after The Eggpire Strikes Back, the episode where Goobot and Ooblar comes back, aired in the United States, so it most likely was due to him passing away before the episode could be dubbed to air in Brazil. and Hélio Ribeiro as Ooblar (replaced by Alexandre Moreno).
Out of Order: "The League of Villains" was the show's Finale Movie, but "Best in Show" was the last episode aired.
Recursive Adaptation: Attack of the Twonkies- originally a spinoff game- got its own special that majorly diluted the game's plot. The twonkies became a Canon Immigrant after this, appearing every now and then as an Easter Egg.
Role Reprise: While replaced by Patrick Stewart and Martin Short for the movie, the series has King Goobot and Ooblar played by S. Scott Bullock and Paul Greenberg, who played the characters in the original pilot Runaway Rocketboy.
Same Voice Their Entire Life: In "The Tomorrow Boys", Jimmy, Carl and Sheen meet their older selves (as well as Cindy as an adult), and they don't sound much different from when they were kids. However, their VAs voice their older selves with slightly different inflections.
Saved from Development Hell: The original storyboard for the pilot was created by John A. Davis in the 1980s. It was later revived as a 40-second test animation called The Adventures of Johnny Quasar in 1995, and later again as a short called Runaway Rocketboy in 1998. The 1998 incarnation was picked up by Nick a few years later and thus the film was made.
Screwed by the Network: DNA Productions shut down in 2006 after The Ant Bully flopped, so the show was cancelled by Nickelodeon after three seasons.
Technology Marches On: In "Time Is Money", Jimmy travels back in time to make his parents rich so he could purchase a set of print encyclopedias, which still existed when the 2002 episode was written, but the writing was on the wall for their obsolescence by a free alternative.
Tie-In Cereal: While Jimmy Neutron never got its own stand-alone cereal, there was a Limited Edition Cap'n Crunch cereal named Cap'n Crunch's Neutron Berries◊, being a version of Oops! All Berries with the "berries" shaped like a rocket, Goddard and Jimmy and Cindy's heads.
Writing by the Seat of Your Pants: DNA Productions had a mere three weeks to create every episode, which is unheard of for TV animation. They were able to save a little face by having the show be CGI, meaning assets could be recycled.
when Jimmy is flying his rocket he almost runs into a car. If you look closely at the driver, you can see the driver is the early design of Hugh (Jimmy's Dad) from the early The Adventures of Johnny Quasar concept.
