One fun thing - on Haunted Mansion, you get to go in a special hallway at the end after the ride itself ends if you are someone they had to slow the ride down for to get on. It was appropriately decorated, not just a backstage area, no special effects or anything, but still kind of spooky with a lowish ceiling and you are all alone when you go to the elevator. It was kind of cool!
I forget if you see the hitchhiking ghosts or not, but I have been on the ride so many times without an ECV the hallway was new to me and special!