When Annie and Bobby's ghost locate the hidden room, Annie's corpses mouth moves, despite being dead.
Whitman Van Ness opens a secret passage to drag bodies of people he has killed out of sight. When Bobby and Annie are searching for the bodies, they would not have needed to find the candle holder that controlled the passage...they could just walk through the wall to find the passage, because they weren't carrying anything from the physical world. Just minutes before, they had walked through the door into the room that contained the entrance to the passage.