Jonah Hill as Michael Finkel

James Franco as Christian Longo

Felicity Jones as Jill Barker

Maria Dizzia as Mary Jane Longo

Ethan Suplee as Pat Frato

Robert John Burke as Greg Ganley

Charlotte Driscoll as Sadie Longo

Kohl Sudduth as Police Officer

Conor Kikot as Zach Longo

Stella Rae Payne as Madison Longo

Byron Jennings as Judge Odenkirk

Gretchen Mol as Karen

Betty Gilpin as Cheryl

Seth Barrish as Blaise

Robert Stanton as Jeffrey Gregg

Michael Countryman as Coroner

Steve Routman as Jack Pool

Genevieve Angelson as Tina Alvis

Adam Mucci as Courtroom Sheriff

David Wilson Barnes as Corey Douglas

William Jackson Harper as Zak Rausch

Sam Rosen as Steve Mensah

Mara Hobel as Jail Receptionist

David Pittu as Marcus Lickermann

Auden Thornton as Lena

Ngo Okafor as Ibrahim

Uchenna Onuaguluchi as Madou

Maryann Plunkett as Maureen Duffy

Joseph Harrell as Visiting Room Guard #1

Mike Houston as Visiting Room Guard #2

Rosemary Howard as Jury Forewoman

Joel Marsh Garland as Dan Pegg

Dana Eskelson as Joy Longo

Peter Francis James as Colin Parker

Edward James Hyland as Mr. Longo

Johanna Day as Beth Tickler

Georgia Ford as Young Woman

Loudon Wainwright III as Older Man

Julie Sharbutt as Female MSU Worker

Eleanor Hutchins as Middle-Aged Woman

Rebecca Henderson as Ellen Parks

Jay Ferraro as Geoffrey J. Ploobtark

Bill Walters as Inmate (uncredited)

Booch O'Connell as Girl in Playground / Student (uncredited)