* Walter Brown also appears in Episodes #17 "The Elusive Ellshaw" and #58 "The Golden Frog"
* Tony Wright also appears in Episodes #7 "The Arrow of God" and #112 "Where the Money Is". He also appears in the episode "Someone Waiting" of The Persuaders
* Meredith Edwards also appears in Episode #68 "The Man Who Could Not Die"
* Nosher Powell also appears in Episode #86 "The Persistent Patriots"
* John Tate also appears in Episodes #46 "The Loving Brothers" and #99 "The Best Laid Schemes"
* Barry Linehan also appears in Episode #20 "Iris"
*
The same extra actor appears in three episodes of the series: Episode
#65 "The Crooked Ring", 
Episode
#68 "The Man Who Could Not Die" and 
Episode
#73 "Interlude in Venice. His name is unfortunately unknown. [Submitted by Wojciech Trojanowski]
*
The third and fourth rows of the audience are only paintings - if you
look for it it looks very strange in all of the following scenes. (0:05)
*
Note that footage of two different Volvo P1800 models is shown in this episode - they can be differentiated by the bumper designs. (0:20 and 0:35)
*
While Roger Moore does the closeups, it's a different actor in the long shots. He looks like Leslie Crawford. (0:29)
*
Roger Moore and Tony Wright are jogging in front of a screen - is that why Wright is running so strangely? (0:34)
*
The 'wall' behind Max looks quite false - no wonder, it's a painting... (0:36)
*
The Saint is even boxing with his laced shoes on! (0:45)
*
Snyder's room set is the same as the one for McCleery in Episode #62 "The Happy Suicide" 
. (0:35)
*
The boxing ring in Episode
#65 "The Crooked Ring" is the same as in Episode #66 "The Smart Detective" 
. [Submitted by Wojciech Trojanowski]