* Kate O'Mara also appears in Episode #87 "The Fast Women" and #91 "The Counterfeit Countess"
* Michael Robbins also appears in Episode #45 "The Saint Steps In" and #111 "The People Importers"
* Martin Wyldeck also appears in Episode #29 "The Noble Sportsman", #64 "The Abductors" and #78 "The Angel's Eye"
* Michael Pemberton also appears in Episode #96 "The Power Artists"
* Iain Blair also appears in Episode #116 "The Man Who Gambled with Life"
* One of the thugs who confront Simon in the Minos Temple is the uncredited Larry Taylor. He also appears in Episodes #20 "Iris" (uncredited), #30 "The Romantic Matron" (as Laurence Taylor), #51 "The Unkind Philanthropist", #66 "The Smart Detective", #72 "The Queen's Ransom" and #117 "Portrait of Brenda"
* Larry Taylor appears in the series "The Persuaders" in the episode "Chain of Events".
*
The stock footage of the starting
airplane was also used in Episode #115 "The Ex-King of Diamonds".
(0:00)
*
Not someone with sunglasses reflected in the glass window of the door. (0:02)
*
Note the continuity error - the newspaper over the gun changes direction from one scene to the next. (0:08)
*
There is hardly noticable cut at the end of this scene. (0:13)
*
The same paintings - with the same frames - hang in Patroclos' office in Athens and 
in his house in London (0:14 and 0:37)
*
The wall ornament with the little
door was also used in Episode #105 "The Time to Die". 
*
The double doors were frequently used as a set item in the colour episodes. In this episode they can be seen twice, once in a different colour and the first appearance of the Greek doorframe and also without the gold inlays.