Michelle Pfeiffer

Character: Rosie

Paul Rudd

Character: Adam

Saoirse Ronan

Character: Izzie

Stacey Dash

Character: Brianna

Sarah Alexander

Character: Jeannie

Graham Norton

Character: Taylor

Jon Lovitz

Character: Nathan

Fred Willard

Character: Marty

Tracey Ullman

Character: Mother Nature

Yasmin Paige

Character: Melanie

Rory Copus

Character: Dylan

O-T Fagbenle

Character: Sean

Jayden Berry-Garvey

Character: Ike

Iddo Goldberg

Character: Director

Noah Lee Margetts

Character: Monty

Jonathan Ryland

Character: Prop Guy

Phil Cornwell

Character: Cameraman

Ray Thacker

Character: Camera Assistant

Twink Caplan

Character: Sissy

Olivia Colman

Character: Hairdresser

Celia Meiras

Character: Editor

Steve Pemberton

Character: Censor

Simon Kunz

Character: Intruder

Archie Panjabi

Character: Casting Girl

Ben Bennett

Character: Woody Wannabe

Chike Chan

Character: Allergy Actor

John-Paul Horsley

Character: Stuttering Actor

Mackenzie Crook

Character: Producer

Peter Polycarpou

Character: 2nd Producer

Doña Croll

Character: Marty's Secretary

David Mitchell

Character: David - Writer

Sally Kellerman

Character: Herself

Ashley Lloyd

Character: Zak

Troy Gentile

Character: Fighting Boy

Cassandra Bell

Character: Pretty Waitress

Ed Byrne

Character: Delivery Boy

Sam Fusaro

Character: Bouncer

Joe Montana

Character: Very Large Guy

Victoria Chalaya

Character: Nathan's Wife

James Harley

Character: Parent

Jennifer Sims

Character: Parent 2

Erin Gavin

Character: Dancer (uncredited)

Rene Costa

Character: Diner (uncredited)

Kya Garwood

Character: Filming Crew (uncredited)

Melanie Martin

Character: Sean's Wife (uncredited)

Wallace Shawn

Character: Math Teacher (uncredited)

Henry Winkler

Character: Self (uncredited)

Ronan Summers

Character: Staff Writer (uncredited)

Lasco Atkins

Character: Club Dancer (uncredited)

Jed Bernard

Character: Bat Boy (uncredited)

Michelle Kochanski

Character: Club Girl (uncredited)

Owen Stanley

Character: John (uncredited)