* Barbara Murray also appears in Episode #33 "The Good Medicine"
* David Bauer also appears in Episodes #8 "The Element of Doubt", #15 "Judith", #38 "The Ever-Loving Spouse" and #93 "Island of Chance"
* Ferdy Mayne also appears in Episodes #28 "The Wonderful War", #84 "Flight Plan" and #95 "A Double in Diamonds"
* John Ronane also appears in Episode #118 "The World Beater". He also appears in the episode "A Home of One's Own" of The Persuaders
* Anthony Wager also appears in Episodes #54 "The Set-Up" and #82 "Paper Chase"
* Barry Linehan also appears in Episode #65 "The Crooked Ring"
* Meadows White also appears in Episode #26 "The Bunco Artists"
* One of the thugs who work for Rick Lansing is the uncredited Larry Taylor. He also appears in Episode #30 "The Romantic Matron" (as Laurence Taylor), #51 "The Unkind Philanthropist", #66 "The Smart Detective", #72 "The Queen's Ransom", #104 "Iris" and #117 "Portrait of Brenda"
* Larry Taylor appears in the series "The Persuaders" in the episode "Chain of Events".
*
Margaret Nolan, uncredited, plays a secretary in this episode. She's probably best known for her role as Dink in the James Bond movie "Goldfinger". [Submitted by Wojciech Trojanowski]
* Bill Strutton was the writer of the "Ivanhoe" series... starring Roger Moore!