* Peter Dyneley also appears in Episode #3 "The Careful Terrorist" and #26 "The Bunco Artists"
* Annette André also appears in Episode #45 "The Saint Steps In", #46 "The Loving Brothers", #64 "The Abductors" and #107 "The House on Dragon's Rock"
* Francis Mathews also appears in Episode #29 "The Noble Sportsman"
* Robert Cawdron also appears in Episode #4 "The Covetous Headsman", #19 "The Work of Art", #42 "Jeaninne" and #64 "The Abductors" (all: same role)
* The character of Inspector Quercy appears several times in the series although played almost every time by a different actor. It's Eugene Deckers in Episode #4 "The Covetous Headsman", Manning Wilson in #19 "The Work of Art" and #42 "Jeannine" and John Serret in # 64 "The Abductors" and #90 "To Kill A Saint"
* John Serret also appears in Episode #15 "Judith", #64 "The Abductors" and #72 "The Queen's Ransom"
* Maggie Wright also appears in Episodes #41 "Lida", #42 "Jeaninne" and #61 "The Crime of the Century"
*
Compare the color of the Citroen
in the Paris scenes and the shots on the back lot.
It's quite obvious that this isn't the same car: the first one is yellow
and the other only light yellow.
*
Templar is supposed to be alone in the car but you can clearly see a second person (a dummy?) with a hat on the passenger seat (0:07).
*
This time Annette is in the car with Templar but if you look closely again in the Paris scenes, then you can see the person/dummy with the hat again (0:34).
*
This corridor was used several times in the colour episodes as a set.
*
The double doors were frequently used as a set item in the colour episodes.