* Cecil Parker already played opposite the Saint: 25 years earlier in the 1942 film "The Saint's Vacation"
* Ferdy Mayne also appears in Episode #20 "Iris", #28 "The Wonderful War" and #84 "Flight Plan"
* Yolanda Turner also appears in Episode #19 "The Work of Art"
* Tim Barrett also appears in Episode #63 "The Chequered Flag"
* Alan Haywood also appears in Episode #96 "The Power Artists" (same role)
* Brian Harrison also appears in Episode #102 "The Desperate Diplomat"
* Ray Austin also appears in Episodes #13 "The Fellow Traveller", #22 "The Rough Diamonds", #52 "The Damsel in Distress", #76 "The Helpful Pirate" and uncredited in #95 "A Double in Diamonds". He would later direct Episodes #102 "The Desperate Diplomat" and #111 "The People Importers"
* It's a classic Inspector Teal episode - peppermints and all!
* The dresses for the fashion parade were provided by fashion designer Norman Hartnell who also worked for the Royal Family. More about him on Wikipedia.
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Note the cuff-links - a dream of every SAINT fan! (0:01)
*
Note the stand-in for Roger at the
fashion show and in front of Lord Gillingham's house.
*
Why does Ben the dealer tell the whole story about the deal with Lord Gillingham to Simon?
*
The falseness of the plane cockpit reminds me of "Plan 9 from Outer Space". ;) (0:29)
*
The same song was used in Episode #85 "Escape Route" (0:07) and in Episode #95 "A Double in Diamonds" 
but with different vocals. Even the following track "played" by the band is the same (0:38).
*
Uncredited, but here is another appearance of Ray Austin. (0:40) [Submitted by Wojciech Trojanowski]
*
There's a reflection of a person in the car's window. (0:42) [Submitted by Wojciech Trojanowski]
* Ben's shop could be the same as the pawnbroker's one in Episode #76 "The Helpful Pirate".
*
The double doors were frequently used as a set item in the colour episodes.