Continuity mistake: After Dennis punches Spence in the nose the piano starts playing and Dennis just pushes it to turn it off even though every time they had to turn it on and off before then they had to use the on/off switch. (01:01:40)
Continuity mistake: When Spence's brother in-law almost crashes into Dennis' girlfriend's car, he's driving straight down the road and she makes a left from the intersection to cut in front of him, but when the camera angle changes back to the inside of the brother in-law's car the intersection that he should have just passed is nowhere to be seen.
Continuity mistake: When Dennis and Spence are trying to outrun the cops in the car that Spence stole from the racetrack, the camera shot from the inside shows them driving on a regular street with the yellow lines and everything but the camera shots from the outside show them driving on blacktop streets with no lines whatsoever.
Continuity mistake: When the doped up Turnip runs past Binky, multiple takes have been sloppily edited together; Binky is giving Turnip a thumbs up in the first shot, then after a cutaway he is shown with his hands on the steering wheel, but taking one off to give the thumbs up, and finally he is again with both hands on the wheel. (01:22:10)
Continuity mistake: Round two of the police firing at the door of the mobster begins. After Denny's girlfriend shows up at the door, we see the police in an external view. To the left of the frame, you can see 2 officers with shotguns positioning next to the car, and two more, one with a rope on his shoulder, are arriving by the captain. In the next shot, the rope guy and his buddy are still arriving, but they are followed by cops with shotguns, which are going where there were already supposed to be in the previous shot, and missing now. (01:18:50)
Continuity mistake: Dennis has just argued with the manager about the fuzzy slippers at work. He is skating off to deal with the last delivery. When there's a cut, notice how there's a man with a white jumper leaning against the white Cadillac, facing the guy with the red jacket. That man in white was not there before. (00:10:15)
Continuity mistake: Dennis followed by Spence is walking out of the bathroom with a handful (soon mouthful) of soap. Camera outside, and to walk out of the bathroom behind them, a guy with a blue jacket who was nowhere near the door, and not one of the two people who were instead seen headed towards the door. (00:21:45)
Continuity mistake: An enraged mafia boss throws the billiard ball to Turnip, who ducks it. The ball after the impact with the door bounces off with a downward trajectory at sharp angle, and yet the next slapstick gag sees Binky, standing a few meters away, hit in the forehead by it. (00:34:20)