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
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)