Revealing mistake: When the Penguin is sliding down the zip line, just before he hits Batman you can see Batman throwing a punch at nobody, he is swinging at empty air.
Revealing mistake: When the Grinch is cutting Max's antler, the cut lines appear on the prongs before he actually starts to cut.
Revealing mistake: All four of the Dachshunds in this story are supposed to be female. During one part of the picture, when they jump on the bed with Suzanne, you can see that at least one is male.
Revealing mistake: After Luther faints from seeing the shears in the painting of Mrs. Simmons, the beam of light from his flashlight continues to move side to side, but Luther's flashlight is in his hand, unmoving.
Revealing mistake: At the Halloween Party, a girl with a green dress says to Charlie Brown, "Charlie Brown, you'll have to model for us." When she says this, she suddenly grows a third hand, then she has two hands again a little later.
Revealing mistake: A safety wire is visible as Grandpa hits the low tree branch that knocks him off his horse.