Continuity mistake: When Fred McMurray dressed as an old man orders coffee at a cafe, as he sits next to a friend, but only the friend gets what he orders, and yet, later on, Fred's coffee is there in front of him on the bar.
Continuity mistake: Joan Crawford said that when she gets nervous, her right foot - due to an accident as a child - slips out of her shoe. But later on, it's her left foot now that causes it to slip out of her shoe.