Jason Biggs as Paul Tannek

Mena Suvari as Dora Diamond

Zak Orth as Adam

Thomas Sadoski as Chris

Jimmi Simpson as Noah

Greg Kinnear as Prof. Edward Alcott

Dan Aykroyd as Dad

Twink Caplan as Gena

Bobby Slayton as Sal

Robert Miano as Victor

Mollie Heckerling as Annie

Colleen Camp as Homeless Woman

Andy Dick as Another City Worker

Steven Wright as Panty Hose Customer

Brian Backer as Doctor

Meredith Scott Lynn as Dog Loving Girl

Stuart Cornfeld as Foreman

Taylor Negron as Photographer

Andrea Martin as Professor

Scott Thomson as Cell Phone Guy

Kedar Brown as Jay

Catherine Black as Military Jacket Girl

Rick Demas as Bouncer

Sanjay Talwar as Convenience Cashier

Tracy Dawson as Drug Saleswoman

Carolyn Goff as Kristen

Mike Beaver as Boy at Concert

Richard Blackburn as Security Guard

Billy Otis as Prisoner

Jenny Kim as Student Worker

Alison Sealy-Smith as University Official

Martin Roach as Veterinarian

Heidi Weeks as Saks Saleswoman

Daniela Olivieri as Store Tailor

Kavita Persaud as Hi Ro Student

Corwin Hall as Hi Ro Student

Andrew Storms as Hi Ro Student

Serena Lee as Hi Ro Student

Nick Bacon as Beer Store Clerk

Valerie Boyle as Aunt

Colleen Reynolds as Aunt

Jack Jessop as Grandfather

Mallory Margel as Paul's Sister

Patrick Mark as Bloody Nose Guy

Tanja Jacobs as Party Goer

Darrin Brown as Party Goer

James Barrett as Guy

Rob Tinkler as Bar Patron

Katherine Giaquinto as College Girl

Robinne Fanfair as College Girl

Clare Preuss as College Girl

Sadie LeBlanc as College Girl

Silvana Kane as College Girl

Kerri Michalica as College Girl

Geoffrey Antoine as Coffee Counter Guy

Danny Truelove as Dancing Kid

Marc McMulkin as Dancing Kid

Jonathon Fernandes as Dancing Kid

Tiffany Leonardo as Dancing Kid

David Spade as Video Store Clerk (uncredited)

Alan Cumming as Alan Cumming / Emcee (uncredited)

Paul Puzzella as T-Shirt Seller (uncredited)