Continuity mistake: In the mansion in the scene at the chess table for half the scene the chess pieces are there. The end of the scene, the pieces are gone.
Other mistake: When Ace is dancing with the unconscious Monopoly Guy, you see a shot of the woman with the fur scarf near the bottom of the stairs. But, when Ace turns around near the bottom of the stairs, she is not there. It might be hard to see, but she was there, the guy on Ace's shoulders would've hit her.