John Cho

Harold Lee

Kal Penn

Kumar Patel

Paula Garcés

Maria

Neil Patrick Harris

Neil Patrick Harris

David Krumholtz

Seth Goldstein

Malin Åkerman

Liane

Kate Kelton

Christy

Brooke D'Orsay

Clarissa

Steve Braun

Cole

Fred Willard

Dr. Willoughby

Rob Tinkler

J.D.

Bobby Lee

Kenneth Park

Anthony Anderson

Burger Shack Employee

Ethan Embry

Billy Carver

Eddie Kaye Thomas

Rosenberg

Ryan Reynolds

Male Nurse

Christopher Meloni

Freakshow

Boyd Banks

E.R. Patient

Gary Anthony Williams

Tarik

Dov Tiefenbach

Hippie Student

Angelo Tsarouchas

Mean Tollbooth Guy

Albert Howell

Security Guard

Shaun Majumder

Saikat Patel

Jordan Prentice

Giant Bag of Weed

John Boylan

Officer Brucks

Thea Andrews

Female Anchor

Jamie Kennedy

Creepy Guy (uncredited)

Jon Hurwitz

Tony (uncredited)

Hayden Schlossberg

Hayden (uncredited)