Walter Pidgeon would again play a pickpocket three years later in his penultimate film, Two-Minute Warning (1976).
Movie directorial debut for Bruce Geller. He was best known as a script writer and as the creator of the TV shows Mission: Impossible (1966) and Mannix (1967). Lalo Schifrin, who wrote this movie's soundtrack, also wrote the classic themes for the two TV shows.
One of several "protege" roles with Michael Sarrazin working with more established actors, including A Man Called Gannon (1968) and The Sweet Ride (1968), with Anthony Franciosa; and The Flim-Flam Man (1967) with George C. Scott (Trish Van Devere's husband).
Two of the film's four main actors are of Canadian birth. Both Messers Walter Pidgeon and Michael Sarrazin hail from the Great White North.