Revealing mistake: When we see the man in the green shirt breakdancing, we can obviously tell that he is a professional breakdancer and not the same guy as the one breakdancing. The professional breakdancer is much thinner and reveals his face, which is completely different from the original man in the green shirt. (04:32:33 - 04:34:23)
Continuity mistake: As Darren passes the cheese touch to the girl, she turns around in shock. In the next shot, she is standing still with everyone crowded around her running away, and Darren is no longer seen.
Susan: Do you have anything you wanna say to women for having owned this offensive magazine?
Rodrick: I'm sorry, women.
Trivia: When the orange dragon scorches the purple dragon to bones on the video game that Greg and Rowley are playing, you can hear the Wilhelm scream.
Question: Was it Rowley or really one of the kids who told the story of how the kids fell in the ditch?
Chosen answer: As said in the film, it was one of the kindergartners who explained the whole story to their parents. It would seem that Rowley would indeed be too soft and cowardly to do such an irrational thing.