Jack Lemmon

Victor Clooney

Walter Matthau

Trabucco

Paula Prentiss

Celia Clooney

Klaus Kinski

Dr. Hugo Zuckerbrot

Dana Elcar

Capt. Hubris

Miles Chapin

Eddie, the Bellhop

Michael Ensign

Assistant Manager

Joan Shawlee

Receptionist

Fil Formicola

Rudy 'Disco' Gambola