Narm: The scene where Jimmy gets hit by the train has many problems. He runs straight into it without looking, the train itself is too slow to normally cause any damage, Jimmy just gets sent flying even though logic dictates it shouldn't, nobody even seems to notice it until the Smash Cut to the next scene, and the editing for Jimmy's movements themselves is incredibly noticeable.
After he gets hit, the actor in the Tux outfit has a dramatic speech about how they have the best doctors around, which is then ruined by him dramatically saying "Zing."
Never Live It Down: Played a large part in cementing the negative sentiment against Cartoon Network's attempts at live-action programming.
Older Than They Think: Although this was the first major live-action production that Cartoon Network, the network had live-action footage on before; however, it was never particularly long.
R&B singer Tinashe was a cast member on the series.
The Scrappy: Craig may in fact be the most hated character from both the movie and series. He's a terrible friend who takes advantage of Jimmy and has No Sympathy for anyone as he tries to be a part of the popular kids.
For that matter, they had the rights to all of Cartoon Network's characters, yet they chose to create original characters instead. They could've at least given this film a "Just Here for Godzilla" appeal by having, oh say, Samurai Jack, the Codename: Kids Next Door, or the Eds be the ones to interact with Jimmy instead of the Appleday toons.
Took the Bad Film Seriously: The voice acting (whether from the main cartoons or one-off guests) was actually pretty solid and a big reason why the cartoon characters were viewers' favorite parts.