Continuity mistake: Pinkie sweeps all the glasses on top of the bar onto the floor, yet after he and his gang have gone we see broken glass on the bar top.
Continuity mistake: When Robert Taylor escapes from the asylum, and is driving the second car he steals, the car is shown at least once with windshield wipers pivoting from above the windshield, then shown with the wipers pivoting from below the windshield. Clearly, these are two different cars. I think the studio borrowed wiper footage from the scene in which he is driving the first stolen car, to use at moments in the scene in which he is driving in the second car.
Plot hole: Early in the movie, when Joe Stefanos tells Mary, the owner of the luncheonette, that he found Jeff Bailey by passing by and seeing the name on the sign of the gas station, it makes no sense. He only knew him by the name Jeff Markham. Even if he was just lying to her, he uses the same explanation when he is alone talking to Jeff. We never know how he found him.aftucci