Revealing mistake: The film contains a few animation glitches which usually only last a frame or two. These could have been fixed during the film's digital restoration, but were left in, presumably because the restorers didn't want to alter a single detail of the original animation. A prime example occurs when Snow White is leading the animals to the Dwarfs' cottage. As she approaches the door, a fawn steps in front of her, and its head completely disappears for one frame.
Revealing mistake: When the piano lid smashes Cary Grant's fingers, the lid obviously stops inches above his hand, even though a drink is positioned on the piano in an attempt to hide the gap.
Revealing mistake: Stan is using a block and tackle to hoist Ollie up to the balcony of Finn's apartment. When Stan lets go of the rope, Ollie falls and lands flat on his back. It is obvious by the awkward angle of the legs that a dummy was used. In addition, the dummy lands with the legs close together but in the shot that follows, Ollie's legs are far apart and one leg is in the air.