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

Chance Crimin

Logan

Jane Adams

April Mitchum

Andy Samberg

Eric

Kate Lyn Sheil

Arielle Smiles

James Anthony Green

Police Officer

Kim Fischer

Female Reporter

Kelly Chapman

News Anchor

Nick Rutherford

Brigsby Bear fan

Reagan Pineda

Reality Talking Head

Kiera Milan Hendricks

Young Smiles Sisters

Tim Heidecker

Coach Brad

Rex Morgan

Gordo

Ellery Davidson

Hannah Slice

Christopher Sullivan

FBI Agent

Joseph Paul Branca

Space Alien

Nikolas Mikkelsen

Theatre Patron

Matthew P. Watts

Prison Guard

Ashlyn Brooke Anderson

Wizzle Prince (uncredited)

Yvonne D Bennett

Party Guest (uncredited)

Kami Christiansen

Nurse (uncredited)

Paul Nathan Cuthbert

Prison Visitor (uncredited)

Teresa Duran-Norvick

Premiere Audience (uncredited)

Gerry Garcia

(uncredited)

Angella Joy

Reporter (uncredited)

Marilyn Miller

Court Reporter (uncredited)

Chris Provost

Prison Guard (uncredited)

Seth Williams

Cameraman (uncredited)