Continuity mistake: When Bugs (dressed as Mugsy) opens the door, there is a door knob on it. But when Bugs knocks on the door pretending to be the police, the door knob has changed to a handle.
Continuity mistake: When Bugs drills a hole in the hotel floorboard, he puts on a nightcap and descends into the hole. But when he emerges from the hole a little later on, he is now wearing a nightshirt.
Continuity mistake: The hotel door at the beginning of the short does not have a handle on it, but when the door opens in the next shot, a handle suddenly appears.