Revealing mistake: Right after Nell sends Hugh to hell, Dr. Marrow and Theo come out of hiding behind a pillar. As Marrow puts his hand on the pillar, it squishes in as if it was made of foam rubber, instead of stone. (01:39:50)
Revealing mistake: In the newspaper that Tom Cruise is reading, the same sentences are printed over and over.
Revealing mistake: When Brom (disguised as the horseman) throws the jack-o-lantern at Ichabod, there is a shot from Ichabod's perspective showing the jack-o-lantern flying toward him. It jiggles from side to side, revealing it was travelling on a wire.
Revealing mistake: During Bartleby's "Prepare to taste God's wrath" diatribe, you can clearly see the seam along the front of his shirt that he uses to tear his shirt open revealing his armour. This seam is not seen at any other point in the movie.
Revealing mistake: When Yoichi's mother is killed, the blood coming from her body is very obviously just colored water, as it is too bright and too thin to really look like blood.
Revealing mistake: When Ashley Judd slams Tommy Lee Jones' car and tips it over, she drives off and skids dramatically to a stop. Just before she skids, you can see several skid marks on the ground from practice or previous takes.
Revealing mistake: When Machine slits Max's throat no blood comes out of the wound. (01:21:55)
Revealing mistake: Pnub's (Elden Henson) head in the scene where Anton kills the two cops is obviously animatronic, it's eyes are clear blue and Pnub's eyes are brown.
Revealing mistake: After Christine gets out of the shower, we hear the director cue her by saying, "Go," before she walks past the camera.
Revealing mistake: When Corso is being pushed through the floorboards (into his proper niche) we can see for a good second or two that it is certainly not Johnny Depp. (The stunt-double is Dominique Fouassier). (01:59:25)