The plastic surgeon has hair with a bald spot and a mustache, but after he operates on Wolfie a second time, and just before being revealed to be Droopy, he is completely bald with no mustache.
When Killer Joe is shaking the plastic surgeon, his mustache disappears and reappears multiple times.
Three officers in the line disappear between the time Droopy is 'volunteered' and the time he leaves the station house.
When entering the cabin, the wolf closes eight doors, in the following sequence: 3-slat barn, screen, 4-panel vertical molding, window over 2 molding panels, metal, picket fence gate, safe, 4-panel horizontal molding. When the wolf tries to exit the cabin, the doors are opened in the following sequence: 4-panel horizontal molding, safe, picket fence gate, metal, window over 2 molding panels, plain blue, screen, 4-panel vertical molding. The sixth and eighth doors are incorrect. The sixth door opened should have been the 4-panel vertical molding, and the eighth door should have been a 3-slat barn door.