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.
Marlin: If this is some kind of practical joke, it's not funny, and I know funny. I'm a clownfish.

Trivia: In the waiting room of the dentist's office you can see a Buzz Lightyear action figure lying on the floor. (00:25:35)
More questions & answers from Finding Nemo
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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.
MasterOfAll