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: The interiors of Miss Price's house is definitely not from a British country house. The ground floor looks more like an American 70's house.