Bruce is not meant to be able to move anything, and yet when he's in the hospital room with Cole, he moves the chair to sit closer to him (for the "I see dead people" scene.)
Actually, he is meant to be able to move things, all they said is that it effects the physical/living world. In there it was only him and Cole...that would in no way effect Cole because to him Malcolm is living, and he can see him. That isn't a slip-up they did it on purpose, because no one but Cole was there to see.
But remember, dead people see what they want to see. At the end of the movie Malcolm discovers that he hasn't even been in his office since he died or he imagined it.
I didn't know that Bruce Willis wasn't allowed to move things. All the other ghosts were able to move things around. At the beginning of the movie a ghost opens all the cupboards in Cole's house. I guess I missed the part where it says that Bruce Willis' character wasn't allowed to move things.
they never said ghosts can't move things. remember the scene with his wife at her shop(i THINK it's a pawn shop, i'm not sure) and she's flirting with that one guy? he slams the door and some of the glass breaks off and when they look it they don't see anyone there.