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 League of Villains - S3-E16
Factual error: As the villains are approaching to Earth, South America is shown just under Asia, connected to the Arabian Peninsula and the southern tip of India. The two continents are nowhere near enough to each other to be seen at the same time from space, much less connected. They are on opposite sides of the Pacific ocean, over 10,000 miles (16,000 km) apart. (00:06:45)
Continuity mistake: When Jimmy is in his lab, in the shot where the camera zooms into his eye, in the shot just before that shot, notice the digital clock on Jimmy's counter. The seconds part jumps from the 30's to the 40's twice in two different shots.
Trivia: In the spy episode where Jimmy, Sheen and Carl are swimming underwater, you can see Spongebob's pineapple next to them.
Who's Your Mommy/Clash of the Cousins - S3-E9
Trivia: One of Jimmy's Uncle's (Baby Eddie's father) is a self caricature of the show's creator, John A. Davis.
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".
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!
Sheen: Jimmy, where's the bathroom? All I see is sand and I'm not a cat.
