This was Gladys Cooper's final acting role before her death on November 17, 1971 at the age of 82. This episode aired more than a month after she died.
Tsar Nicholas,s Daughter Anastasia is mentioned as escaping Russia in 1918 as it was believed at the time of the program that a woman called Anna Anderson living in the U S claiming that she was Anastasia might be genuine, only many years later was it proved that she was not.
While under arrest, Danny, ( Tony Curtis), removes his handcuffs twice. Tony Curtis portrayed Houdini in a biography of the Escape Artist.
For the Fans of 'The Saint', when Brett and Danny drove off from the Police Station, a short tune or rendition that's reminiscent of 'The Saint' Theme was played briefly.