Continuity mistake: When Dandy Dan's gang are getting ready to throw the pies at Doodle, if you look at Laughing Boy's pie, in the first two shots the white creamy stuff on top is all over the sides. In the next two shots the pie is neat and tidy.
Plot hole: Captain Smolsky only gets hit in the back with the plaster. So why, later on, is his entire body covered in hardened plaster, like a mummy?
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.
Continuity mistake: When Dandy Dan's gang invade Mama Lugini's, they smash the pane of glass, and jump through. When he smashes it, only about half of the pane falls out. Next shot, the gang are assembled, and the pane is fully smashed.
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.
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.
Revealing mistake: This film is set in New York, yet most of the "down and outs" seen towards the end of the film have London accents.
Factual error: Cagey Joe's pullover definitely looks more 1976 than 1926.
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.