First off, I had to make a profile just to comment on this movie.
Second, I want to address that there was probably more to the Lawyer/Manager (Priscilla) subplot than what we saw:
When Mike goes to confront his lawyer who's "got the cutest shorts [he's] ever seen" and asks who else is in it with them, the two of them look at each other before Priscilla clearly lies about it being just the two of them. Since they pretty much admit to the steam room and don't deny the diving board, I think that the two of them summoned the spirit of Mike's dead wife. The paranormal obviously exists in that world, looking at the events of this movie. Their partnership with Catherine would help to explain why the lawyer breaks into that office during the party (which I assume is Priscilla's since it doesn't look like where we saw Mike and Rainbow Clit tossing the football earlier). The lawyer is trying to remove any evidence that links him to the spirit while Priscilla is going in to do the same. He only hits her because she stupidly picks out matching costumes to wear with Mike or he was always planning to double cross her. (He is the king, isn't he?)
Think about it. Who makes sure that the computers aren't shut off? Who stresses the importance of the costume party? Who even admits to setting up the scene at the beginning? They had this thing planned from the start. The lawyer and manager are the puppeteers with Priscilla quite possibly being the eponymous "Witch."
I hate you guys for making me care so much about this dumb movie. I can't wait for the next one.