Continuity mistake: After their first number, Ted and Jim are in their dressing room, Jim is buttoning his left cuff and then pulls down his right sleeve. In the next shot, he does this again.
Continuity mistake: When Abbott and Costello are on the train. Costello walks over to see the guys playing poker. In the background a man closes the back door of the train. As Costello passes you see the door is open again and the same guy closes it again. (00:17:10)
Continuity mistake: In the dressing room scene just before Mr. Albee's visit, as Jerry Cohan is talking he wraps a scarf around his neck. He leaves one end outside of the dressing gown, but in the next shot, both ends are tucked in.
Continuity mistake: When the moth is in the bar, he pulls off part of the man's trouser leg and eats it. You can see that the tear mark has pieces of cloth around it, but when the moth says "And pre-war cuffs too!" the pieces of cloth have completely disappeared.