Cooper Raiff

Hal

Lili Reinhart

Harper

Betty Gilpin

Kate

Mark Ruffalo

Dad

Alyah Chanelle Scott

Jesse

Christopher Meyer

Kalen

Addison Timlin

Audrey

Daphne Abinante

Young Harper (age 6), Young Harper (Age 6)

Brady Jerome

Young Hal (2004)

Havana Rose Liu

Abby

Christine Woods

Ms. Havens

Michelle Pascarella

Mom

Asher Alexander

Josh

Ayla Manji

Mitali

Lincoln Bloomfield

Eli

Azra Anna Kearns

Jessica

Pierce Nation

Chris

Keen Ruffalo

Hal's Roommate