Continuity mistake: During the scene in which Ben is introduced to the card-counting group, several members are sitting at a blackjack table. There are cards on the table in front of them. In the first shot, the cards are face up, in the next, they are face down, then they appear face up again. While no one is seen or heard dealing cards, the number of cards on the table changes in several shots.
Continuity mistake: The subway scenes between Jill and Ben show someone in a coat with black and white squares get on the train. However, a later scene shot throughout the subway car's window shows this same person wearing the same type of coat sitting down on a bench with a friend at the subway station as the train pulls away.