Continuity mistake: If you look carefully at the monster (Frankenstein) you will see that his face is different in the ending scenes. The reason is, during the movie you see the monster take the woman doctor and throw her out the laboratory window. You then see the monster kind of stumble, which he really did and broke his ankle. So in the final scenes they replaced Lon Chaney Jr. as wolfman with a stuntman, and Lon Chaney Jr. finished the movie as the monster.
Visible crew/equipment: During the movie whenever Bob Hope is pulled off the wagon by his team of horses you can see a board leaning against the wagon that was used to help the stunt man when he was pulled off the wagon.
Audio problem: In a scene when the Blandings first move into their dream house, Cary Grant (Jim Blandings) says something to a workman and his lips clearly don't match what is heard.
Continuity mistake: When Tweety hits Sylvester on the paw with a mallet, the background behind Sylvester changes between shots.
Continuity mistake: When Yosemite Sam steps off the cliff during the "crossing lines" game, he is holding two guns, but when we see him falling, the guns are nowhere to be seen.
Continuity mistake: When the little dog pulls out the box containing a duck call whistle, he puts down his gun on the ground. When he and the big dog run off to find Lucky Ducky, the gun has disappeared.
Continuity mistake: When Bugs (dressed as an old man) is talking to MacRory by the burrow, you can see MacRory's gun is by the burrow. But when Bugs says "Games?" and brings back a card table, the gun has disappeared.
Continuity mistake: When Donald takes the ant carrying the green bean off the knife, he has the knife in his hand. When he puts the ant on the ground, the knife has disappeared.
Continuity mistake: When we first see the baby bird in its nest at the beginning of the cartoon, you can see that the nest is positioned on a branch, but when we see the bird attempting to fly later on, the nest is now in the crook of two branches.
Revealing mistake: When Tom is punctured in the rear by the fork that Nibbles is holding, his tail is missing.
Continuity mistake: When Elmer catches Sylvester breaking his dishes, Elmer's position changes between shots.
Continuity mistake: When Chip slides down the drainpipe and holds on the frame to get to the window of Donald's house, you can see that there is nothing in front of the window, but when Chip is looking into the kitchen in the next shot, a cord has suddenly appeared.
Revealing mistake: When Mr. Peabody is fishing, it is obvious that he is in a boat on the floor of a studio. Rear-screen projection is used to show the ocean behind him, but while he is standing in the boat and trying to reel in his catch, the boat is absolutely motionless.