Adaptation Displacement: Very few people remember that this film actually originated from test animations by the main character's creator.
Award Snub: Inverted. It was amongst the first nominees for the newly-created "Best Animated Feature" Oscar, against Shrek (which won) and Monsters, Inc.. Hardcore animation fans were offended that something so juvenile would be given such an honor.
Throughout the film, Cindy regularly refers to Jimmy by his first name; this is hilarious in the fact that in the TV series, she rarely does so, preferring to address him as Neutron (or "nerdtron", among other mocking nicknames), and this is lampshaded in the episode "Stranded".
One time, Goobot throws one of his henchmen out of the airlock, which the Junkman threatens to do to Jimmy, Carl and Sheen in his introductory episode.
While using one of his inventions that changes his hair (Robo-Barber), Jimmy ends up with a ponytail ("You go girl!") similar to Cindy's in the TV series.
Inferred Holocaust: No infants and senior citizens were present at the film's climax, which means they were left all alone in the town.... Some might have had older siblings, but can we expect all the kids to account for all the helpless babies?
Iron Woobie: Jimmy. He's constantly being picked on for his small size by other people, but that never stopped him from continuing on with his life and enjoying his small group of friends.
This scene◊ of Sheen's Show & Tell presentation is often edited where Sheen and the UltraLord figure are replaced with different people and objects. Usually used as commentary on overexposure of a product, joke, or current event.
Moral Event Horizon: Goobot crosses it when he reveals the parents of the kids are going to be sacrificed to Poultra, and how it's all Jimmy's fault because of Jimmy's transmission.
Signature Scene: The kids using the amusement park rides as rockets to take off into space.
The Problem with Licensed Games: The PC game adaptation is pretty bad. It suffers from typical movie-based game flaws such as dated graphics that hardly compare to most PS1 games, short playtime, and clanky controls. The plot bears little resemblance to the movie and is heavily scaled back as well, though it at least does have the original voice cast reprising their roles. The console version fares little better, with platforming not designed around the game mechanics at all.
Uncanny Valley: Though less than the tests and series, where the frame rate makes the film clear it is animated, the CGI still hasnt aged that well.
Unintentionally Sympathetic: Skeet. To many kids in the show's target demographic he comes across as the show creators intended- as a humorless stickler for the rules. Older viewers who have actually held jobs, however, are more likely to view Skeet as actually being right, whether because he often comes off as more sensible than Jimmy, or because those viewers know that when working a job, it's often important to swallow your pride and do as your superiors say even if you disagree with them.
What an Idiot!: When the aliens kidnap all the parents in Retroville, they leave behind nothing more than a very suspicious note informing that the parents have gone on vacation. You'd Expect: For someone, anyone, to pick up on the many, many clues that this is a Contrived Coincidence: the obvious type-face "writing" on the note, the ambiguous "Dear son/daughter" address, the fact that it happened overnight to every single parent with zero foreshadowing, and the fact that it happened to everyone at the exact same time. Instead: Everyone would rather focus on the fact that they no longer have to deal with parents, which is a bit understandable given that they're kids and want to bask in this newfound freedom, but even after the novelty wears off, nobody stops and thinks about how suspicious the whole thing is (or at least not on-screen), not even the boy genius himself. It takes Jimmy listening to a recording Goddard made for him the night before for it to finally click that the letter might be fake, and even then, he has to run a comparison on several handwritten letters to figure that part out.