George Segal
— Brooks Wilson
Eva Marie Saint
— Selma Wilson
Sterling Hayden
— Lepridon
Keenan Wynn
— Edward
Nancie Phillips
— Nelly
Janis Young
— Grace
David Doyle
— Will
Paul Sparer
— Marve
Andrew Duncan
— Willy
Sherry Lansing
— Susan
Roland Winters
— Plommie
Edgar Stehli
— Mr. Kramm
Calvin Holt
— Danny
Mina Kolb
— Diane
Diana Douglas
— Mrs. Shavelson
David Ford
— Al
James Manis
— Charles
Mart Hulswit
— Ted
John Fink
— Brad
William Duffy
— Jay
Irving Selbst
— Benny
Martin Harvey Friedberg
— Roger
Lorraine Cullen
— Lizzie
Cheryl Bucher
— Hannah
Ed Crowley
— Mr. Shavelson
Roy Scheider
— Skip
Sab Shimono
— Byron
Eileen O'Neill
— Cindy
Diane Davies
— Barbie
Robert Paget
— Party Guest (uncredited)