Corrected entry: When Charlie is walking home from school, just before he reaches the candy store, you can clearly see a "Beavis and Butthead" poster on the wall. The movie is set at least thirty years before the creation of this cartoon.
Corrected entry: Mr. Wonka says he transported the whole Oompa Loompa population to his factory. Then why is it that as the movie progresses, we see no female Oompa Loompas? This could cause a great question to how Charlie will have any workers when he takes over the factory.
Correction: We don't know much about the anatomy of Oompa Loompas, but perhaps they just divide down the center like flatworms and make two new Oompa Loompas. A scary thought, I know, but it's possible.
PiemanmooCorrected entry: Mrs. Teevee refers to the music Wonka plays on the Musical Lock as Rachmaninov. It is actually the beginning of The Marriage of Figaro by Mozart.
Correction: This is a joke rather than a mistake; it is used to highlight the arrogance of Mrs Teevee and the fact she thinks she knows everything (ie. that there is no OompaLoompa land)
Correction: Nothing to do with when the movie was set - it was made years before B & B were even thought of (1971). It's actually an old Cadbury chocolate ad on a vending machine.