Walter Matthau as Henry Graham

Elaine May as Henrietta Lowell

Jack Weston as Andy McPherson

George Rose as Harold

James Coco as Uncle Harry

Doris Roberts as Mrs. Traggert

Renée Taylor as Sharon Hart

William Redfield as Beckett

Graham Jarvis as Bo

Jess Osuna as Frank

David Doyle as Mel

Fred Stewart as Mr. von Rensaeller

Mark Gordon as John

Rose Arrick as Gloria Cunliffe

Conrad Bain as Professor Heinrich (uncredited)

William Hickey as Smith (uncredited)

John O'Leary as Desk Clerk (uncredited)

Ida Berlin as Maid (uncredited)

Mildred Clinton as Mrs. Heinrich (uncredited)

Trent Gough as Victor the Butler (uncredited)

Carol Morley as (uncredited)

Cindy Rubenfine as Dodi Heinrich (uncredited)

Ellen Stretton as (uncredited)