At the end of the episode, there is a promo for Alfred Hitchcock's newest film The Trouble with Harry (1955).
At Hurstwood Manor, the book that Sir Stephen hands over to Latimer is titled, "Ghosts of Notable British Homes", and the story Latimer later reads concerns "The Hurstwood Ghost".
This episode takes place in London in May 1940 and October 1945.
This same story was done earlier on The Gentleman from America (1950) and then later on in The Gentleman from America (1958).