...in case anyone was wondering:

In "Djinn And Water", the "botanist" was portayed by Chet Stratton (who also turned up in "My Master, The Magician" as 'Nestor the Great', and one other episode in 1967, I forgot which one....).

The part of Roger's landlord in "Is There An Extra Genie In the House?" was filled by Herbie Faye.

The other woman who appeared in the seance sequence of "Bigger Than a Breadbox and Better Than A Genie" (Sidney Sheldon's mother, Natalie Leeb, was her companion) was Queenie Smith- Sidney himself confirmed this in his autobiography, "The Other Side Of Me".

"Professor Prever", in "My Master, the Rich Tycoon", was played by Maurice Dallimore.

The "bear", who appeared in "U-F-OHH Jeannie!" and "Dr. Bellows Goes Sane"
was impersonated by Janos Prohaska, who donned the same fur a year later as a regular character on "THE ANDY WILLIAMS SHOW". Prohaska was also the "dodo" in the "Allergic To Macedonian Dodo Birds" episode of "BEWITCHED"
(a similar outfit had been used by him on a "LOST IN SPACE" episode in 1966).

There's more, but that's enough for now!