Jason Segel

Will Harbor

Rooney Mara

Isla

Robert Redford

Dr. Thomas Harbor

Jesse Plemons

Toby Harbor

Riley Keough

Lacey

Ron Canada

Cooper

Brian McCarthy

Andy

Kimleigh Smith

Pam

M.J. Karmi

Janice Phillips

Adam Khaykin

Oliver

Mary Steenburgen

Interviewer

Connor Ratliff

Coroner

Willie C. Carpenter

Hospital Janitor

Wendy Makkena

Mom

Lindsay Schnebly

Newscaster

Richard O'Rourke

Marvin (uncredited)

Paul Bellefeuille

Pat Phillips (uncredited)