Factual error: When the boys are sent back to the Cretaceous era, they come across a leptictidium, a small, bipedal mammal they call "Leppy." Leptictidium were not around in the cretaceous, they didn't appear until around ten million years after the dinosaurs went extinct, in the early Paleogene. They also lived in Europe, not North America.
The Adventures of Jimmy Neutron: Boy Genius (2002)
Episode list - season 2
Starring: Rob Paulsen, Debi Derryberry, Jeffrey Garcia, Mark DeCarlo
More mistakes in The Adventures of Jimmy Neutron: Boy Genius
Cindy: Origami - the ancient art of Japanese paper folding. I will be making the most difficult of all origami sculptures - a snow monkey...
Jimmy: Actually, paper folding originated in China...
Cindy: ...riding a flying dragon...
Jimmy: ...in the second century CE...
Cindy: ...while drinking tea...
Jimmy: ...and was brought to Japan...
Cindy: ...on a ladder...
Jimmy: ...in the sixth century!
Cindy: ...in December!
Miss Fowl: Cindy, I didn't know you and Jimmy were doing your report together!
Who Framed Jimmy Neutron?/Flippy - S3-E14
Trivia: The theme song during the title screen and throughout the episode "Who Framed Jimmy Neutron" sounds similar to the theme song for the show "Cops".