Continuity mistake: When Marlin and Dory are looking at the boats trying to find the one that took Nemo, they swim past a boat that says "Jerome's Raft." on it. When Nigel swoops down and gets them, the boat is completely missing, and the boat that was next to it is now the one closest to the dock.
Factual error: The film is explicitly set on the east coast of Australia. However Nigel is a Brown Pelican (Pelecanus occidentalis), a species only found in the Americas. The only pelican species found in Australia is the Australian Pelican (Pelecanus conspicillatus) which is mainly white, with black wing tips. If a Brown pelican was somehow transported to Australia and subsequently escaped into the wild, it would have been caught and destroyed under Australia's strict quarantine laws.
Marlin: If this is some kind of practical joke, it's not funny, and I know funny. I'm a clownfish.
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)
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).
Tailkinker ★