Warren Beatty
Harley Rummel
Leslie Caron
Michele O'Brien
Robert Cummings
Dr. Philip Brock
Keenan Wynn
Angelo Carelli
Lionel Stander
Sam
Asa Maynor
Rusty
Cathleen Nesbitt
Mrs. Brock
Michael Bradley
John Thomas
Warren Mitchell
Frank Focus / Panel Moderator
Sydney Tafler
Panel Participant
Michael Kane
Staff Doctor
Riggs O'Hara
Glue Sniffer
Mavis Villiers
Rusty's Mother
Margaret Nolan
Mail-Order Film Girl
Viviane Ventura
Mail-Order Film Girl
George Moon
Neighbour
Charlotte Holland
Neighbour
Ferdy Mayne
Vittorio Fettucini
Libby Morris
Clinic Mother
Bessie Love
Pet Shop Customer
Jill Adams
Mrs. B.M. von Crispin
Donald Sutherland
Autograph Seeking Father (uncredited)
Jo Anne Worley
Autograph Seeking Mother (uncredited)
Anita Sharp-Bolster
Mrs. Egan (uncredited)
Chuck Julian
Grocery Clerk (uncredited)
Vera Goulet
Nurse (uncredited)
Michael Chaplin
Heathcliff – Beatnik (uncredited)
Pauline Chamberlain
Woman in Audience (uncredited)