Goof: When giving Peter's description to the nurse at the clinic, Mike said he has green eyes. However, Peter's eyes are really brown.
The menu that Mike reads from saying "My Patient" is from Vincent Van Go Go.
Micky: And, thus will it always end for men who use their knowledge of medicine for evil and badness!
Mike: Come, my trusty cohorts, let us to the Monkeemobile. Away!
Davy, Micky, Mike: Away!
Nurse: I don't suppose you're old enough to qualify under medicare.
Davy: Well I wasn't when I came in here.
Part of Micky's riding the exercise bike with the riding crop would be used in the opening montage used in the second season and later in the syndicated version.
The day following the firstrun telecast of "The Case of the Missing Monkee" saw the release of Monkees album #2, otherwise known as More Of The Monkees (#COM/COS-102).
Features the song: "(I'm Not Your) Steppin' Stone." "Pleasant Valley Sunday" replaced "Steppin' Stone" when "The Case of the Missing Monkee" reaired on NBC July 24, 1967.