Character mistake: In the scene where the dentist is doing a root canal, Bloat says "rubber dam and clamp installed?" and another fish replies "yes", but when the picture goes back to the dentist and patient you can plainly see that there is not a rubber dam on the patient. A rubber dam is a large piece of latex attached to a metal frame, to keep water from the dental handpiece from going into the patient's mouth. Although all of the dental jargon in the film is precisely accurate, this device would have been very noticeable.
Finding Nemo (2003)
1 character mistake
Factual error: Jacques the cleaner shrimp is in a lot of trouble. He is sharing an aquarium with Bloat, a long-spined porcupine fish. Shrimp and other crustaceans are their favourite food.
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Suggested correction: Suspension of disbelief. Sharks eat fish, and don't try to rehabilitate themselves to not eating fish. Besides I'm sure the others would have convinced Bloat not to eat Jacques.
Gurgle: Oh, the human mouth is a disgusting place.
Trivia: The kid in the waiting room is reading a comic with Mr. Incredible on the cover, from the Disney/Pixar movie The Incredibles. (01:19:25)
Question: What kind of bird is Nigel? He looks a lot like an Albatross to me.
Chosen answer: Nigel is a pelican - he appears to be modelled on a Brown pelican (although that particular species is not actually native to Australia).