Revealing mistake: When the ghost (Bugs Bunny) tells Scrooge that he is going to take him to "the man in the red suit", the ghost puts his arms up but the shadow does not.
Revealing mistake: In an overhead view of Oliver Hardy going down the sawdust chute, you can see it is a stunt double.
Revealing mistake: When the governor and warden reverse the car back into the paint truck at the end of the film, watch carefully and you can see the two barrels of whitewash tip over before the impact.
Revealing mistake: When Tom is sitting by the window looking at Toodles at the start of the cartoon, his tail is missing.
Revealing mistake: When Bugs Bunny is walking away from Elmer Fudd, you can see a futuristic building in the background that keeps disappearing repeatedly when it reaches the end of the frame.
Revealing mistake: After the alley cat has put Fernando in his mouth, Speedy runs back and forth before hitting the cat on his foot. If you watch carefully, you can see nothing hits the cat's foot at all, but he reacts as if in pain.
Revealing mistake: When Giovanni Jones performs his first note after Bugs Bunny takes over the conductor's duties, Jones's hands turn white.
Revealing mistake: When the Level 3 Sentry is firing up into the air for no apparent reason, it fires some rockets with a clear defined smoke trail behind them and disappear off screen. Then the shot jump cuts to further away and suddenly the smoke appears again, but the end of the smoke trails are solid and crisp indicating the animators used the smoke animation as if the rockets had just been fired from that spot... in the middle of the sky. (00:01:10)
Revealing mistake: When Oliver is holding the drunk, he says "We'll have it in just a jiffy." Arthur Housman (The Drunk) then repeats the line, and you can see Oliver Hardy mouthing the line as well.
Revealing mistake: When we first see Yosemite Sam at the tiller at the beginning of the cartoon, he moves the wheel back and forth but the capstan and rope do not move even though they are meant to be attached to the wheel.
Revealing mistake: When Tom is punctured in the rear by the fork that Nibbles is holding, his tail is missing.
Revealing mistake: Harold Lloyd is trying to cross a busy intersection. Apparently the scene was double-exposed. As one car passes by, it appears translucent and the streetcar tracks can be seen through it.
Revealing mistake: When we see the duckling growing up to being Daffy Duck, the calendar behind him keeps changing months but the position of the days are exactly the same.
Revealing mistake: When we Yosemite Sam holding on to a branch on the tree after the explosion, some of the apples are being held on to the branches without their stalks.
Revealing mistake: When Speedy Gonzales is watching Sylvester drink Tabasco sauce from the tank that sends him miles into the horizon, watch Speedy's tail: it disappears before the scene ends.
Revealing mistake: When Melissa Duck runs down the aisle with the Scarlet Pumpernickel at the church, you can see that the other wedding guests in the background have no faces on them.