Ben Stiller
Roger Greenberg

Greta Gerwig
Florence Marr

Rhys Ifans
Ivan Schrank

Jennifer Jason Leigh
Beth (Beller's Party)

Mark Duplass
Eric Beller (Beller's Party)

Merritt Wever
Gina

Chris Messina
Phillip Greenberg

Brie Larson
Sara

Juno Temple
Muriel

Susan Traylor
Carol Greenberg

Mina Badie
Peggy

Chris Coy
Guy at Gallery

Norizzela Monterroso
Female Vet

Blair Tefkin
Megan (Beller's Party)

Dave Franco
Rich (Sara's Party)

Max Hoffman
Jerry (Sara's Party)

Ramona Gonzalez
Anita (Sara's Party)

Alessandra Ford Balazs
Olivia (Sara's Party)

Layla Delridge
Girl with Beer (Sara's Party)

Koby Rouviere
Greenberg Boy