Miss Sludge's cigarette changes length from scene to scene. It's also full length and unlit when she hits W.C. Fields with it.
The sound of the ball bouncing in the fountain sometimes doesn't match the video; it can be heard clinking in the cone when it's hovering at one point.
The fan in the background is in some scenes of the ping pong game and off again during the fast cuts.
W.C. Fields' stunt double can be spotted when he flips through the air in one scene at the end.