Continuity mistake: When Fat Sam's gang are singing "Bad Guys", at the beginning of the song, just after they pick up the magazines, there is a close up of Snake Eyes. In this shot ("But don't it make your heart glad"), Snake Eyes does not have a toothpick in his mouth. In the next shot when it shows all four gang members he does have a toothpick in his mouth.
Continuity mistake: When Blousey and Bugsy are eating ice cream, note in Blousey's close-ups (from the front), her left hand is on the straws, near her face. In the shots of Bugsy when it shows Blousey from behind, her left hand is resting at the bottom of the glass. This also occurs with her right hand repeatedly.Movie_Freak 1
Continuity mistake: In the beginning, the gang are listening to the radio about the splurging of Roxy Robinson. Fat Sam, in his anger, shoots the white ball off the pool table. In the very next shot of him (when he says, "So tell me."), the white ball is back on the table as if he hadn't touched it.Movie_Freak 1
Continuity mistake: During the song "My Name is Tallulah", Tallulah takes a dark-coloured beverage from a passing waiter's tray to drink. The scene then cuts to the dancers on the stage, then back to Tallulah who puts the drink back on the tray, but the remaining liquid in the glass is now completely clear, with no trace of dark residue.
Continuity mistake: When Fat Sam claps his hands after hitting Dandy Dan with a pie during the fight towards the end of the film, you can see that Fat Sam's face and suit are completely clean, but when we see Sam only seconds later the top of his suit and chin are covered with cream.
Continuity mistake: When O'Dreary and the policemen are lifting Captain Smolsky into the car after he has been covered in plaster they change position when the angle changes.
Continuity mistake: In the scene where Captain Smolsky is covered in plaster when the police car arrives Capt Smolsky is driving, O'Dreary is in the front passenger seat and there are two uniformed policemen in the back seat, but when the angle changes to the front of the car four uniformed policemen get out of the back seat.