Kyle Mooney

James Pope

Mark Hamill

Ted Mitchum

Jorge Lendeborg Jr.

Spencer

Matt Walsh

Greg Pope

Michaela Watkins

Louise Pope

Ryan Simpkins

Aubrey Pope

Greg Kinnear

Detective Vogel

Alexa Demie

Meredith

Beck Bennett

Detective Bander

Claire Danes

Emily

Jane Adams

April Mitchum

Andy Samberg

Eric

Kate Lyn Sheil

Arielle Smiles

Nick Rutherford

Brigsby Bear fan

Tim Heidecker

Coach Brad

Nikolas Mikkelsen

Theatre Patron

Yvonne D Bennett

Party Guest (uncredited)

Kami Christiansen

Nurse (uncredited)

Teresa Duran-Norvick

Premiere Audience (uncredited)

Gerry Garcia

(uncredited)

Marilyn Miller

Court Reporter (uncredited)

Chris Provost

Prison Guard (uncredited)

Julio Torres

Man Getting Haircut (uncredited)