Other mistake: During the Oompa Loompas' first number (Augustus Gloop), the lyrics are animated on the screen - but one word doesn't match. The song line is "What are you at getting terribly fat"; the words on-screen read "WHERE are you at."
Other mistake: The sign which Silver reads says that one's got ten seconds to get away after pulling the chain. But in fact, after the monkey pulls the chain, fifteen seconds pass before the detonation (I've been counting).
Other mistake: When the Mayflower truck is on the move picking everyone up for the heist, a mysterious hole appears above the truck's cab, cut out in the letter "o" in "Mayflower" when Pop is picked up, that wasn't there a moment before, and then it vanishes. The same thing occurs after the heist, when the truck crashes into the police cars.