Revealing mistake: Near the beginning of the film, when Clang is outside the Beatles' flat on his delivery bike, you can plainly see the rope tied to the front of it giving him a pull as he starts to ride off. In the next shot the rope is gone.
Revealing mistake: When Steve McQueen is in the hotel room very upset with Karl Malden because he was helping him win, he picks him up and slams him against the door. If you watch when this happens the entire wall shakes.