Trivia: Paramount's press releases in 1967 claimed that the Soviet news agency Pravda had complained about Star Trek having no Russian characters, so they were adding Chekov. This story was completely bogus. (Star Trek never aired in the U.S.S.R.) NBC wanted to appeal to the 8-14 teenybopper crowd, and asked Roddenberry to add a character who looked like Davy Jones of the Monkees. So Chekov debuted in season 2, replete with a bad Beatle wig that was, thankfully, soon jettisoned.
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Trivia: At the very end, in talking about the future of the two characters, Spock says, "We could say that Mr. Seven and Miss Lincoln have some interesting experiences in store for them." While this seems like a strange thing for him to say, this episode was a "backdoor pilot" for a spinoff series with the same title (see Teri Garr's Wikipedia entry). But the idea wasn't sold and Mr. Seven and Miss Lincoln never had any further interesting experiences. The Enterprise's history log was evidently wrong.
Trivia: Some parts of the film Kirk and Spock watch are historical footage, some of it is made specially for this episode. If you look very closely you can see the Fuhrer Adolf Hitler in a car at one of his ceremonies. Beware he is hard to spot, because most of the time his head is behind some flags.
Trivia: In this episode, Scotty tries to get a Kelvin drunk. When asked what the liquor is, Scotty says "It is green." In the episode "Relics" (The Next Generation) Scotty asks Data what the unnamed liquor is, Data sniffs the bottle and says "it is... (sniffs)...it is... (sniffs)...it is green"
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Trivia: According to the screenwriter David Gerrold, the producers of the show noticed a similarity of the plot line and story concept to Robert A. Heinlein's story "The Rolling Stones" and asked Heinlein for permission to use the idea. Heinlein asked for an autographed copy of the script, but otherwise did not object, noting that both stories owed something to the Ellis Parker Butler's 1905 short story "Pigs is Pigs" and perhaps "Noah". (Source "The Trouble With Tribbles: the birth, sale and final production of one episode" by David Gerrold).
Trivia: Director Marc Daniels employed an old trick to save Nona's topless bathing scene from NBC's censors. He deliberately shot twice the needed footage, including risque side shots exposing portions of bare breast. After the censors excised the "most naked" portions, what remained was precisely what Daniels had wanted to begin with: a bare-backed Nona bathing in the waterfall.
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