Revealing mistake: During the song "Mark it Up", when Pavi supposedly snatches the panties/thongs off of the two girls, you can see they are already in his hands before he does so.
If you look closely, during the song "21st Century Cure", several of the gravestones feature names of the producers.
In the original cut of the film, the Grave Robber character was in more sequences, and directly interacted with Shilo more often. During editing, in order to get the film to a shorter running length, several of his scenes were cut, and he became more of a narrator in the film than a featured character.
This film is actually the middle of an intended trilogy. Director Darren Lynn Bousman has created plans for both a prequel and a sequel with the creators of the original stage play upon which this film is based. Due to the limited theatrical release, the fate of the follow-ups will depend solely on DVD sales.