* According to the audio commentary by Robert S. Baker on the Umbrella DVD this episode was actually written by Harry W. Junkin under the "Jack Sanders" pseudonym.
* This is not only the first episode shown on TV but also the first one written & shot. (audio commentary)
* Photographer Frank Herrmann was invited to Elstree Studios in Borehamwood to capture the production of the first episode. You can find two photos - Roger Moore in front of his dressing room and in the Volvo, plus a contact sheet of all photos that offers a fascinating insight into the production here on the website of Pap Art. It's also possible (but expensive) to buy prints.
* Shirley Eaton also appears in Episodes #9 "The Effete Angler" and #100 "Invitation to Danger"
* Shirley Eaton is the golden girl from "Goldfinger"
* John Kelland also appears in Episode #23 "The Saint Plays with Fire"
* Howard Douglas also appears in Episode #29 "The Noble Sportsman"
*
When John Clarron walks over to Adrienne's house the first time she seems
to notice him although he's in her back. Seems like Clarron's greeting
was forgotten to be edited in (0:07).
*
In the scene when John Clarron visits Adrienne before his departure to
London: Look closely at the Clarron's house, when Simon and Clarron leave.
It's clearly to see that it's just a painting (0:25).
*
The shot of the incoming train was used twice. Look out for the train driver (0:26 and 0:32).
*
You can see the shadow of the boom microphone moving above the actors (0:44).
*
It's not actress Patricia Roc (Madge) who is led up the stairs by Shirley Eaton but a stand-in (0:47).
* Commentary with Sir Roger Moore, Robert S. Baker & Johnny Goodman on the Umbrella DVD
* Commentary with Robert S. Baker, Johnny Goodman and Ken Baker on the network DVD