Revealing mistake: During Jack's memories, when he is holding the antlers up to his head, Jack's sister's boot can be seen coming through the fabric of her dress.
Revealing mistake: Just after Superman and Supergirl have their talk about him going after Brainiac, it cuts to Lois at the Daily Planet on her laptop. There is a close up and you can see her fingers on the keyboard. She is typing really fast, but the animation shows her fingers just hitting the same 3 or 4 keys over and over again. (00:20:05)
Revealing mistake: Near the end of the film, Charlie Brown, Linus and Snoopy all cast shadows from the moon, and then suddenly seconds later all the shadows are fully gone. Also, no shadows were cast from any other object around them when the shadows were shown on the characters.
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.
Revealing mistake: When the businessman rushes back into his bed after closing the window that Daffy opened, he is wearing his normal trousers.
Revealing mistake: When Junior Bear is spinning Pa Bear in the air with his legs, you can see Junior's head detach momentarily.
Revealing mistake: When the mice are feeding the cat, the cat sits up and a mouse passes through his head.
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 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 the dog picks up the stick of dynamite, you can see the stick is not lit, yet it still manages to blow up.
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: 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: When Giovanni Jones performs his first note after Bugs Bunny takes over the conductor's duties, Jones's hands turn white.
Revealing mistake: When Tom is punctured in the rear by the fork that Nibbles is holding, his tail is missing.
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 Bugs performs his tap-dancing act at the theatre, he puts on a Panama hat that goes through his ears. When you see the top of the hat, there are no holes in it.
Revealing mistake: When Sylvester is on the run from Porky, he dives under the bed, but the cels of him diving were placed over the bed, so that he appears to dive on top of the bed and disappear.
Revealing mistake: When the lady throws Sylvester through the window, you can see there is a bump on Sylvester's head before he hits the tree.
Revealing mistake: When Bugs is applauding with the audience after Daffy has blown himself up, his tail disappears for a second.
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.