Jack Lemmon

Harry Hinkle

Walter Matthau

Willie Gingrich

Ron Rich

Boom Boom Jackson

Judi West

Sandy Hinkle

Cliff Osmond

Purkey

Lurene Tuttle

Mother Hinkle

Harry Holcombe

O'Brien

Les Tremayne

Thompson

Marge Redmond

Charlotte Gingrich

Ann Shoemaker

Sister Veronica

Ned Glass

Doc Schindler

Howard McNear

Mr. Cimoli

Sig Ruman

Professor Winterhalter

Noam Pitlik

Max

Judy Pace

Elvira

Helen Kleeb

Law Firm Switchboard Operator and Receptionist

Bartlett Robinson

Specialist #1

Ben Wright

Doctor

Dodie Heath

Nun

William Christopher

Interne (as Bill Christopher)

Herbie Faye

Maury - the Equipment Man

Billy Beck

Maury's Assistant

Herbert Ellis

TV Director (as Herb Ellis)

Robert DoQui

Man in Bar (as Bob Doqui)

John Anderson

Abraham Lincoln (uncredited)

Jim Brown

Running Back - Number 32 (archive footage) (uncredited)