Dick Van Dyke
— Claude R. Fitzwilliam
Barbara Feldon
— Juliet Nowell
John McGiver
— Albert
Edith Evans
— Miss Victoria Woodworth
Harry Townes
— Mr. Nowell
John Fiedler
— Mr. Morton Dunne
Anne Seymour
— Grimsby
Norman Fell
— Oberblatz
Cecil Kellaway
— Buckmaster
Stephen Strimpell
— Byron Casey
Helen Kleeb
— Mrs. Mortimer
Paul Reed
— Prettikin
Albert Carrier
— Pierre
Nelson Olmsted
— Simmons
Dennis Cooney
— Assistant D.A. Elliot Adams
Noam Pitlik
— Charles
Anthony Eustrel
— Garland
Sam Waterston
— Oliver
Karen Norris
— Kitty
Patience Cleveland
— Dolly
Lew Brown
— Frank
Monroe Arnold
— Goldfarb
Robert Williams
— Ryan
Laurence Naismith
— Mr. Cotty (uncredited)
Barbara Morrison
— Mrs. Mudge (uncredited)
Kenner G. Kemp
— Bar Patron (uncredited)
Fletcher Allen
— Reporter (uncredited)
Merie Earle
— Elderly Shoplifter (uncredited)
John Alban
— Customer (uncredited)
Ruth Foster
— Customer (uncredited)