The "Christmas Shopping" sign to the right of the front door in Barney's clock shop is missing the first "P" in some scenes, but in others, it's there.
During the attempt to break into the safe, Charlie looks down into the elevator shaft. The pov shot shows Bunky's body on the girders below, before he fell in the shaft.
When Walter (Bunky) (Jack Kehoe) falls into the elevator shaft, Charlie goes down to see if the guy is still alive. Charlie finds out it's a cop with a wire tape on him. When Charlie checks Bunky's pulse in his neck, the actor leans into Charlie's hand when he's supposed to be dead.