Roger Moore cast his daughter Deborah Moore as the Little Girl. He wrote in his memoir that she wore her own school uniform, which got him in trouble with her headmistress for not clearing permission. When his then-wife Luisa Mattioli came to the set and started telling Deborah what to do, she said, "Daddy is the director, not you". That did not go down well.
The second of two episodes directed by star Roger Moore. The first was The Time and the Place (1971).
Four castmembers had previously made guest appearances opposite Roger Moore in The Saint (1962) - Glynn Edwards in The Gadget Lovers (1967) and The Organisation Man (1968), Valerie Leon in To Kill a Saint (1967), Geoffrey Cheshire in Geoffrey Cheshire, Derek Chafer in four different episodes.
Two castmembers would later co-star with Roger Moore in James Bond films - Madeline Smith in Live and Let Die (1973) and Valerie Leon in The Spy Who Loved Me (1977).
Roger Moore wrote in his memoir that Danny's original line while inspecting the mounted head was "This General Bulstrode is a one-man abattoir". Tony Curtis refused to say it, as he didn't know what an abattoir was, so if he didn't understand it, then nobody in America would. He suggested changing the line to "butcher's shop".