* Fabia Drake also appears in Episode #40 "The Miracle Tea Party"
* Barry Shawzin also appears in Episode #58 "The Golden Frog"
* Martin Miller also appears in Episode #42 "Jeannine"
* Reg Lye also appears in Episodes #46 "The Loving Brothers" and #71 "The Old Treasure Story"
* Larry Taylor also appears in Episodes #20 "Iris" (uncredited), #30 "The Romantic Matron" (as Laurence Taylor), #51 "The Unkind Philanthropist", #72 "The Queen's Ransom", #104 "The Double Take" (uncredited) and #117 "Portrait of Brenda"
* Larry Taylor appears in the series "The Persuaders" in the episode "Chain of Events"
* Michael Cramoy also wrote for the radio series from the 40ies.
*
Yes it's night, but why are there
so many cars with lights on at the side of the street? (0:08 and 0:09).
*
It's the old painted drum trick
in the car scenes (0:15).
*
The same car chase was used in Episodes #22 "The Rough Diamonds" (0:39) and #66 "The Smart Detective" (0:17). [Submitted by Wojciech Trojanowski] This also explains why two different versions of the Volvo P1800 can be seen in the car chase - note the different bumpers. Footage of the old model is also used elsewhere.
*
This shot is reversed - check the number plate (0:20).
*
The name "Miss Dallas" was not
really painted on the boat - it looks like a strip of adhesive tape (0:22).
*
The Asian lion prop was used in Episode
#65 "The Smart Detective" (0:24) and in Episode #67 "The Persistent Parasites" 
(0:43). [Submitted by Wojciech Trojanowski]
*
The boxing ring in Episode
#65 "The Crooked Ring" is the same as in Episode #66 "The Smart Detective" 
. [Submitted by Wojciech Trojanowski]