Jack Lemmon as Victor Clooney

Walter Matthau as Trabucco

Paula Prentiss as Celia Clooney

Klaus Kinski as Dr. Hugo Zuckerbrot

Dana Elcar as Capt. Hubris

Miles Chapin as Eddie, the Bellhop

Michael Ensign as Assistant Manager

Joan Shawlee as Receptionist

Fil Formicola as Rudy 'Disco' Gambola

C.J. Hunt as Kowalski

Bette Raya as Mexican Maid

Ronnie Sperling as Hippy Husband

Suzie Galler as Pregnant Wife

John Schubeck as Newscaster

Ed Begley Jr. as Lieutenant #1

Frank Farmer as Lieutenant #2

Tom Kindle as Highway Patrolman #1

Biff Manard as Highway Patrolman #2

Charlotte Stewart as Nurse

Neile Adams as Saleswoman

Myrna Dell as Cashier

Gene Price as News Announcer

Ben Lessy as Barney Pritzig

Patti Jerome as Matron

Gary Allen as Man in Robe

Frances Bay as Female Patient

Dean Bruce as Policeman

Rod Gist as Policeman

Steve Hershon as Policeman

John Cutler as Orderly

Billy Beck as Gentleman

David Carlile as Reporter #1

Archie Lang as Reporter #2

Regina Leeds as Reporter #3

Frank Dent as Reporter #4

Timothy Sullivan as SWAT Team Member

Troy Melton as Leopold Schuster

June Smaney as Housewife

Lorna Thayer as Lady

Jennifer Fajardo as Polynesian Girl

Patrick Bishop as Native

Wendell Titcomb as Native