- The Cast Showoff: Charles Napier wrote some of the songs he sings in this episode.
- Creator Backlash: James Doohan said this was the only Original Series episode he didn't like. Grace Lee Whitney (Yeoman Rand from season one) likewise likened it to "Spock's Brain" as one of the worst the show ever aired. Walter Koenig thought it was out of character for the youthful Chekov to act as an "establishment-loving conservative," in contrast to the hippies, and called it a low point for his character. D.C. Fontana was unhappy with the rewrite of her original script, and requested to be credited under her pseudonym "Michael Richards".
- Name's the Same: The "Michael Richards" who wrote this episode was regular Trek writer D.C. Fontana under her pen name, not Cosmo Kramer.
- New-Age Retro Hippie: In this episode, Spock is shown as being sympathetic to the hippies and secretly sharing their idealism. Bjo Trimble, an unofficial and official publicist for Star Trek over the years, says the show always had a substantial hippie following, based on Mr. Spock and the realization that "he didn't belong anywhere"note . Many fans gave themselves new names or nicknames that reflected both Vulcan and hippie elements.It is my sincere wish that you do not give up your search for Eden. I have no doubt but that you will find it, or make it yourselves.
- Playing Against Type: Laid back musician Adam is a quite shocking departure for Charles Napier, who almost always played stiff military types. He would even come back to the franchise as exactly that in Deep Space Nine!
- Unintentional Period Piece: The fact that the episode features space hippies is enough to date it to the late sixties.
- What Could Have Been: The original concept for this episode, by D.C. Fontana, was entitled "Joanna" and was to have introduced Joanna McCoy, Bones' daughter (whom Fontana and DeForest Kelley had created between production of the first two seasons), who was to have been college-aged and (inevitably) fallen in love with Kirk, driving a rift between the two friends; the episode was intended as an allegory of the "generation gap" which was being widely discussed at the time.note The episode would have also established Bones as having been divorced (acrimoniously) from Joanna's mother, which was reused for Star Trek (2009). It only got as far as the outline stage before the story was radically rewritten under the regime of showrunner Fred Freiberger and story editor Arthur Singer. The changes to the script, particularly the removal of Joanna from the story (her part was radically rewritten into that of Irina Galliulin, and her romance with Kirk transferred over to one with Chekov), led to Fontana asking to be credited under the pseudonym Michael Richards.
- You Look Familiar: Dr. Sevrin looks suspiciously like that wannabe Hitler from the Nazi episode "Patterns of Force."
Trivia / Star Trek S3 E20 "The Way to Eden"