Who you gonna call?

Our source passed along more info today, namely that while most of what we presented before in terms of casting is supposedly solid at this point, Christopher Walken is still listed as being in negotiation. As are Jonah Hill, Sigourney Weaver, Christopher Lee and Gene Wilder (!).

Robin Williams, Chevy Chase and Owen Wilson are set to cameo and, sadly, Rick Moranis has chosen not to attend this party, unlike the first party, when he invited clients instead of friends.