Jack Lemmon as George Kellerman

Sandy Dennis as Gwen Kellerman

Sandy Baron as Lenny Moyers

Anne Meara as Purse Snatching Victim in Police Station

Robert Nichols as Passenger

Ann Prentiss as Airline Stewardess

Ron Carey as Barney Polacek, Cab Driver in Boston

Philip Bruns as Officer Meyers

Graham Jarvis as Murray the mugger

Carlos Montalbán as Manuel Vargas

Robert King as Agent in Boston

Johnny Brown as Waiter in Train

Dolph Sweet as Police Sgt Kavalefski

Thalmus Rasulala as Police Officer

Jon Korkes as Looter

Robert Walden as Looter

Dort Clark as Man on Train

Richard Libertini as Baggage Man - Boston

Paul Dooley as Day Desk Clerk at Hotel

Anthony Holland as Desk Clerk Night

Billy Dee Williams as Clifford Robinson, Lost & Found Clerk

Bob Bennett as Man in Phone Booth - Boston

Paul Jabara as Hippie (uncredited)

Ray Ballard as

Maxwell Glanville as

Milt Kamen as

Norma Jean Kron as

Alfred Mazza as

Thomas McGowan as

Merrie Lynn Ross as

Arthur Tovey as