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 - chronological order
Factual error: When the fish tank has been cleaned by the newly installed laser fish cleaner, the machine states that the water temperature is '82°.' In Australia the Celsius scale is used; therefore, it should be about '28°.' Australia is 100% metric and has been since 1974! Nobody in Australia - nobody, anywhere, any time since 1974, uses imperial measures. There is absolutely no question of the dentist having an imperial thermometer or expressing himself in° Fahrenheit. It is actually illegal to import or sell any instrument using 'Imperial' scales. You couldn't buy a Fahrenheit thermometer if you tried. (01:14:30)
Marlin: If this is some kind of practical joke, it's not funny, and I know funny. I'm a clownfish.
Trivia: The dentist's name, P. Sherman, is a homage to the many Filipino crew members, whose native accent made the English word 'fisherman' sound like P. Sherman.
Question: I read somewhere that there is a reference to fight club in this film. I just wondered if anyone had spotted it and if they have can they point it out please?
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Answer: This reference is pretty hard to spot. You need to be very familiar with Fight Club and David Fincher. The reference occurs in the scene when Gill is describing the plan to escape from the fish tank. The camera work and linear flow through a sequence of events closely remembles the early scene in Fight Club where the Narrator describes what is about to occur in Operation Mayhem.
hannisen