Megan Fox

Jennifer Check

Amanda Seyfried

Anita “Needy” Lesnicky

Johnny Simmons

Chip Dove

Adam Brody

Nikolai Wolf

J.K. Simmons

Mr. Wroblewski

Amy Sedaris

Toni Lesnicky

Kyle Gallner

Colin Gray

Chris Pratt

Roman Duda

Cynthia Stevenson

Mrs. Dove

Sal Cortez

Chas

Juan Riedinger

Dirk

Juno Rinaldi

Officer Warzak

Josh Emerson

Jonas Kozelle

Nicole Leduc

Camille

Aman Johal

Ahmet from India

Dan Joffre

Raymundo

Candus Churchill

Nutritionist

Carrie Genzel

Mrs. Check

Emma Gallello

Little Jennifer

Megan Charpentier

Little Needy

Jeremy Schuetze

Craig

Valerie Tian

Chastity

Emily Tennant

Gossiping Girl

Karissa Tynes

Other Girl

Eve Harlow

Goth Girl

Michael Brock

Goth Boy

Genevieve Buechner

Goth Girl #2

Adrian Hough

Colin's Dad

Gabrielle Rose

Colin's Mom

Michael Bean

Priest

Bill Fagerbakke

Jonas' Dad

Marilyn Norry

Jonas' Mom

Cut Chemist

DJ at Dance

Ed Anders

Orderly

Roxanne Wong

Patient #1

Diane Dutra

Patient #2

Andrea Baker

(voice)

Cathy Cavadini

(voice)

Lanei Chapman

(voice)

Vicki Davis

(voice)

Jeff Fischer

(voice)

Aaron Fors

(voice)

Barbara Harris

(voice)

Jeremy Maxwell

(voice)

David Michie

(voice)

Levi Nunez

(voice)

Paige Pollack

(voice)

David J. Randolph

(voice)

Roger Craig Smith

(voice)

Joel Swetow

(voice)

Andreana Weiner

(voice)

Lennon Wynn

(voice)

Diablo Cody

Melody Lane Drinking Woman (uncredited)

Lance Henriksen

Passing Motorist (uncredited)