I think they could use a small scale version of the 3-D building crumble from Acid Assault last year, to mimic the transfer from the real world to the other world. Like in 1:20 of the new movie trailer.
Maybe have a real world larger scale room, then a quick black out, then project the otherworld tearing image. It would be a lot of work to get it to work every night the same way. I think it could be very effective though.
I would also like if they used a loud sword scraping sound for a pop-up queue for pyramid head. These are just things i'd like to see, but i'll be happy with whatever they do!