Lenny Baker as Larry Lapinsky

Shelley Winters as Faye Lapinsky

Ellen Greene as Sarah Roth

Lois Smith as Anita Cunningham

Christopher Walken as Robert Fulmer

Dori Brenner as Connie

Antonio Fargas as Bernstein Chandler

Lou Jacobi as Herb

Mike Kellin as Ben Lapinsky

Michael Egan as Acting Teacher

Rashel Novikoff as Mrs. Tupperman

John C. Becher as Casting Director

Jeff Goldblum as Clyde Baxter

Joe Spinell as Cop

Denise Galik as Ellen

Rochelle Oliver as Doctor Marsha

Sol Frieder as Mr. Elkins

Helen Hanft as Herb's Wife

John Ford Noonan as Barney

Carole Monferdini as Southern Girl

Gui Andrisano as Marco

Joe Madden as Old Poet

Rubin Levine as Street Violinist

Milton Frome as Drugstore Customer (uncredited)

Paul Mazursky as Casting Director (uncredited)

Bill Murray as Nick Kessel (uncredited)

Vincent Schiavelli as Party Guest (uncredited)

Rutanya Alda as Party Guest (uncredited)

Stuart Pankin as Party Guest (uncredited)

Annie Gagen as Acting Student (uncredited)

Kandice Stroh as Acting Student (uncredited)

Frankie Verroca as Acting Student (uncredited)

Billie Perkins as Hippie Girl (uncredited)

Filomena Spagnuolo as Old Lady on Street (uncredited)