Zach Braff as Michael

Jacinda Barrett as Jenna

Casey Affleck as Chris

Rachel Bilson as Kim

Michael Weston as Izzy

Eric Christian Olsen as Kenny

Marley Shelton as Arianna

Lauren Lee Smith as Lisa

Harold Ramis as Professor Bowler

Blythe Danner as Anna

Tom Wilkinson as Stephen

David Haydn-Jones as Mark

Cindy Sampson as Danielle

Lisa MacKay as Stripper #1

Patricia Stasiak as Stripper #2

Mark Walker as Mark's Father

Erika Rosenbaum as Eva

Alexis Legault as Matty

Olivier Legault as Matty

Simon Alain as Arianna's Lover

Ian Finlay as Architect Partner

Barry Julien as Young Architect

Alexandra Ruddy as Kim's Friend

Mariah Inger as Secretary

Monique Phillips as Female Patient

Danny Blanco Hall as Bartender

Andrew Shaver as Camper Salesman

Danny Wells as Izzy's Uncle

Goûchy Boy as Michael's Neighbor