"A man gives his friend a series of lessons on how to cheat on one's wife without being caught."
Walter Matthau
as Paul Manning
Inger Stevens
as Ruth Manning
Sue Ane Langdon
as Irma Johnson
Jackie Russell
as Jackie Russell
Robert Morse
as Ed Stander
Aline Towne
as Mousey Man's Wife
Claire Kelly
as Harriet Stander
Eve Brent
as Joe X's Blowsy Blonde
Marvin Brody
as Taxi Driver
Majel Barrett
as Mrs. Fred V.
Marian Mason
as Mrs. Rance G.
Tommy Farrell
as Rance G.'s Hanger On
Linda Harrison
as Miss Stardust
Jason Wingreen
as Harry 'Big Fella' Johnson
Pat Becker
as Party Guest
Fred Holliday
Robert Patten
Ray Montgomery
Virginia Wood
as Bubbles
Lucille Ball
as Technical Adviser (Mrs. Joe X)
Jack Benny
as Technical Adviser (Ollie 'Sweet Lips')
Polly Bergen
as Technical Adviser (Clara Brown)
Joey Bishop
as Technical Adviser (Charlie)
Sid Caesar
as Technical Adviser (at Romanoff's)
Art Carney
as Technical Adviser (Joe X)
Wally Cox
as Technical Adviser (Married 14 years)
Hal March
as Technical Adviser (Man who loses coat)
Louis Nye
as Technical Adviser (Irving, House Buyer)
Carl Reiner
as Technical Adviser (Rance G.)
Phil Silvers
as Technical Advisor (Realtor)
Terry-Thomas
as Technical Adviser (Harold aka Tiger)
Ben Blue
as Technical Adviser (Shoeless)
Ann Morgan Guilbert
as Technical Adviser (Charlie's Wife)
Jeffrey Hunter
as Technical Adviser (Mountain Climber)
Marty Ingels
as Technical Adviser (Meat Eater)
Sam Jaffe
as Technical Adviser (Shrink)
Jayne Mansfield
as Technical Adviser (Girl with Harold)
Sanita Pelkey
as Girl in Introduction (uncredited)
Delores Wells
as Very Attractive Woman (uncredited)
Joy Harmon
as Party Girl in Bar (uncredited)
Dee Carroll
Jackie Joseph
as Janet Brophy
Heather Young
as Girl with Megaphone
Evelyn King
as Female Plaintiff
Nancy DeCarl
as Woman with Baby
Warrene Ott
as Woman with Gun
Michael Romanoff
as Romanoff's Maitre D'
Karen Arthur
as Lady Dinner Partner at Romanoff's
Damian London
as Lone Male Diner at Romanoff's
Chanin Hale
as Miss Crenshaw
Julie Tate
as Woman in Bed at Motel
George N. Neise
as Man in Bed at Motel
Tim Herbert
as Shoe Clerk
Patricia Sides
as Mau Mau Dancer at Bantu Cusine
Pat McCaffrie
as Happy Hour Motel Clerk
Jimmy Cross
as Mr. Brown
Elaine Devry
as Jocelyn Montgomery
Gene Kelly
Director
Joseph MacDonald
Director of Photography
John Williams
Original Music Composer
Frank Tarloff
Book
Screenplay
