Rumbelow is seen wearing an Oldham Athletics Club tracksuit - actor Eric Sykes was born in the Lancashire town.
The Crossleys' Great Dane Junia (trained by future British TV star Barbara Woodhouse, whose trademark "Walkies!" command is used by Rumbelow at one point) appeared as John Steed's pet in the Cathy Gale era of The Avengers (1961).
This film was a minor success at the box office, earning MGM a profit of $89,000 (over $888,000 in 2023) according to studio records.
The only feature film appearance by Anna Russell, as Mrs. Clifford. Russell was beloved for her comedy recordings and concert show in which she explained and played all the roles in Wagner's 20-hour operatic "ring cycle" in 30 minutes.
The murder plot is straight out of an Agatha Christie Tommy & Tuppence story.