Continuity mistake: During the scenes at the airfield early in the film the sky changes between shots from blue to grey.
Revealing mistake: Inspector Emil arrives at the morgue; pay attention to the body, just before he asks "You are...?" to Armstrong, the sheet covering the cadaver rises and fall as the departed takes a few deep breaths. (00:32:00)
Factual error: Druids worshipped things like nature, not Greek gods like Zeus.
Revealing mistake: When Dr Dolittle is talking to the parrot and it raises its left leg, you can see a piece of string running past Dolittle's head used to raise its leg.
Other mistake: The villain's plan is to impersonate along with his large crew a platoon of the Mexican army. He already captured the soldiers and has them incapacitated, all he needs to do is take their uniforms. Instead of doing so, though, he mows down the whole lot with a heavy machinegun. When it's time to put on the show, everyone wears nice and tidy white uniforms.
Factual error: When Miriam is pacing, waiting for Tony to come home, she is listening to Tony singing "Come Live with Me" on a reel-to-reel tape recorder, but the recorder has no speakers, either built-in or separate.
Revealing mistake: Despite the best efforts, you can tell the fabled white rhino is just a prop on wheels.