Revealing mistake: In the scene where Coraline is in the garden in the other world looking for the ghost eye, she looks through the magical seeing stone and spots the other father on his mechanical praying mantis tractor. When he arrives at the bridge, and it snaps, he breaks off the ghost eye from the gear stick and then he collapses through the bridge into the water. But if you look closely, he is slipping through what looks like some black material, not real water. (01:01:25)
Suggested correction: It's the other world, it'll probably not have real water. It makes more sense to be a black substance.