Revealing mistake: The same clip of Curly getting hit on the top of the head with a lump of clay is shown twice during the clay fight.
Revealing mistake: Right after McQueen asks what the Ghostlight is, it cuts back to the other cars. Luigi is right next to the firetruck and some gas pumps. The firetruck's door is very reflective, and the gas pumps are visible in it. But Luigi is right by the pump, and he is not reflected in the firetruck's door. (00:02:10)
Revealing mistake: As Lulu is pulling her fishing pole out of the school steps, you see if you watch closely that the pole actually passes through the concrete of the steps rather than her lifting it over. (00:02:00)
Revealing mistake: When Charlie Brown stops to watch Snoopy sitting atop the doghouse, eating dog bones, the pile of bones never goes down even though Snoopy takes from the pile three times. (00:03:25)
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 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 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 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 the traveller crosses the drawbridge towards the end of the cartoon, the edge of the cel is visible.
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 the old lady falls off her chair, you can see the wire pulling her off. (00:03:35)
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 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 Junior Bear is spinning Pa Bear in the air with his legs, you can see Junior's head detach momentarily.
Revealing mistake: Ollie throws a flower pot at Stan. Stan ducks and the pot continues through the house, breaking a window and hitting a gardener outside. On the DVD of the film, the long wire the flower pot is attached to is visible.
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: Near the end of the movie, when Wallace says: "hold tight lad, and think of Lancashire hotpot" one picture of a sheep on the ceiling slightly moves a few times. (00:19:57)
Revealing mistake: When Jerry walks towards the crab with the soda bottle cap stuck on his head, one of the crab's legs disappears for a frame or two.
Revealing mistake: When Stan falls off the balcony and into the fountain when throwing Oliver's bowler hat back at him, you can see water marks on the walls caused by splashes from previous takes.