Colin Firth as Arthur Newman

Emily Blunt as Mike Fitzgerald

Lucas Hedges as Kevin Avery

Anne Heche as Mina Crawley

M. Emmet Walsh as Zazek

Kristin Lehman as Mary Alice Wells

Phillip Troy Linger as Fuller Wells

Sterling Beaumon as Grant Wells

Autumn Dial as Charyl

Steve Coulter as Owen Hadley

Devon Woods as Janie Wells

Natalia Volkodaeva as Ludmilla

Holden Hansen as Dying Man

Anthony Reynolds as Park Ranger

Ron Prather as Detective #1

Jason Benjamin as Cop

Daniel Jones as Hairy Man

Jack Landry as Doctor

Sol Miranda as Rosita Tully

Peter Jurasik as Bus Driver

Estes Tarver as Cart Rental Man 1

Brennon Olsen as Diving Kid

Gray Hawks as Diving Dad

David Andrews as Chuck Willoughby

Bonnie Johnson as Ticket Agent

Laura Anne Green as Girl

Rachael Moser as April

James Patrick Freetly as Cart Rental Man 2

Matthew Warzel as Motel Clerk

L. Warren Young as Deputy

Sharon Conley as Unemployment Official

Beckett Campbell as Kevin (5 yrs)

Michael Beasley as Detective #2

Tammy Arnold as Nurse

Jason Hatfield as Pug Man

Dean Chekvala as Hipster Trevor

Nicole LaLiberte as Silverlake / Echo Park Hipster Artsy Bohemian Girl

Luing Andrews as Body Guard 1

Chase Sargent as Bestfriend

Michele Seidman as Lounge Singer