One of the signs out in front of Tewfik's camera shop (the one on the right-side, with his name, 'Tewfik. at the top, and 'Cameras Are Sold Here', along the bottom) reads (in Arabic); 'Six Powerful Spice(s)..
The message contained in the microdot (requesting immediate withdrawal of the fish) translates as a daily weather forecast.
When Drake leaves Rowland, he says, "Be seeing you" - which is the standard parting in The Prisoner (1967).
A headshot of Patrick McGoohan, used frequently - both here in Secret Agent (1964)
(in such places as in the opening credits - where the title forms over it), as well as in The Prisoner (1967) was lifted from this episode.