The floating heads are not a central mode from the house, but instead are a deadhead mode for the crypt. Bash the crypt a couple of times, crypt opens, shoot crypt and you are now in a floating deadhead mode, keep bashing the crypt until it opens again, shoot it and complete the deadhead mode. There's a ton more to the game than just the deadheads.
Also, you can bypass the elvira speech by hitting both flipper buttons,.just like you can do in DP.