Nanette Burstein Director Drew Barrymore Erin Actor Justin Long Garrett Actor Charlie Day Dan Actor Jason Sudeikis Box Actor Christina Applegate Corinne Actor Ron Livingston Will Actor Oliver Jackson-Cohen Damon Actor Jim Gaffigan Phil Actor Natalie Morales Brandy Actor Kelli Garner Brianna Actor June Diane Raphael Karen Actor Rob Riggle Ron Actor Sarah Burns Harper Actor Terry Beaver Professor Actor Matt Servitto Hugh Actor Leighton Meester Amy Actor Geoff LaTulippe Screenwriter Adam Shankman Producer Jennifer Gibgot Producer Garrett Grant Producer Dave Neustadter Executive Producer Richard Brener Executive Producer Michael Disco Executive Producer Eric Steelberg Cinematographer Peter Teschner Film Editing Mychael Danna Original Music Kevin Kavanaugh Production Design John Kasarda Art Director Peter Rogness Art Director David Schlesinger Set Decoration Catherine Marie Thomas Costume Design Kathleen Chopin Casting Juel Bestrop Casting Seth Yanklewitz Casting