Its done by the same guy who did the Buffy the Vampire Slayer series, and you can definitely tell. He really has his own style that is very evident in this piece. Its really excellent how he incorporates his dark sensibilities into the movie.
Also, I think this was done during the writer's strike. It definitely had the "independent" film feel, and Howard from the Big Bang Theory is in this movie as "Moist". I mean pretty much literally too, his character has the same haircut as Howard, which leads me to believe he couldn't change it during the strike because he wanted to go back to the Big Bang Theory.