Yeah, I thought it was pretty funny. The friend I saw it with and I actually briefly discussed the personality types of the main characters afterwards, and we basically just came up with:
Phil - SP (probly ESTP)
Alan - NF (INFP?) (the whole wolfpack thing and his idealistic notions throughout)
Stu - SJ (probly ISFJ - the way he kept defending his cheating girlfriend)
Oh, and Mike Tyson's an SP, too.
Nobody else's personalities were really developed enough to make much of a guess.