Karyn Kusama Director Megan Fox Jennifer Actor Amanda Seyfried Needy Actor Johnny Simmons Chip Actor Adam Brody Nikolai Actor J.K. Simmons Mr. Wroblewski Actor Amy Sedaris Toni Lesnicky Actor Kyle Gallner Colin Gray Actor Chris Pratt Roman Duda Actor Cynthia Stevenson Chip's Mom Actor Juno Rinaldi Officer Warzak Actor Carrie Genzel Jennifer's Mom Actor Juan Riedinger Dirk Actor Josh Emerson Jonas Kozelle Actor Ryan Levine Mick Actor Sal Cortez Chas Actor Diablo Cody Screenwriter, Executive Producer Daniel Dubiecki Producer Mason Novick Producer Jason Reitman Producer Theodore Shapiro Original Music Stephen Barton Original Music M. David Mullen Cinematographer Plummy Tucker Film Editing Mindy Marin Casting Katia Stano Costume Design Arvinder Grewal Production Design Paolo G. Venturi Art Director Joanne Leblanc Set Decoration