I found a cool website talking about mistakes made in the JN original movie; check it outtttt!!!!
Continuity: In the scene where Jimmy Neutron is giving birthday presents to his mum he pulls out a necklace and some earings from a bag. His mum only takes the necklace from him but the earings are no longer in his hand.
Continuity: Nick's necklace is a string looped through a ring, but sometimes the string makes only one pass through the ring and sometimes two.
Continuity: In the opening sequence, Jimmy uses a long string from Carl's shirt to help launch the satellite. Jimmy then launches Carl from the rocket. That same morning, Jimmy finds Carl hanging from a tree, and his shirt is intact.
Continuity: In the classroom after Cindy is done explaining her dinosaur report she heads back to her desk, Jimmy and Cindy get in an argument when it cuts to Jimmy, in the background you see Carl standing up and not sitting.
Audio problem: When Nick tells Jimmy, Carl, and Sheen about sneaking out to Retroland, he skates off into the ally and says "Anyone who matters is gonna be there", his lips aren't in sync with the sound.
Factual error: In the scene where Cindy is giving her "fossil-to-chromosome ratio" report, she calls her model dinosaur skeleton a plesiosaur. However, the skeleton is of a bipedal dinosaur (likely a hadrosaur, judging by the "duckbill"), while plesiosaurs were aquatic reptiles with flippers instead of feet.
Continuity: In the scene where Jimmy's parents are kidnapped, their bedroom is next to the kitchen, however, in other parts in the movie, the parents' bedroom is upstairs.
[source] http://www.moviemistakes.com/film2500Continuity: In the scene where Jimmy goes to check his experiments, you see a fish tank type thing and when he gets there he then checks the invisible hamsters and the girl eating plant, but when he gets to the burping soda the fish tank thing is gone.
:rock: W00T people that have so much time on their hands they can spot stuff like this!
