Trivia: The slanting crawlway that leads up to the warp-drive nacelles is referred to as a "Jefferies tube." This is a tribute to art director Walter M. Jefferies.
Trivia: Actress Lee Meriwether says she was teased daily by a playful DeForest Kelley while shooting "That Which Survives." He continually pulled down the glued-on cloth rectangle that NBC insisted should conceal her navel, then squinted at her tummy and asked, "What time is it?" On the final day of filming, she got back at him. When Kelley peeled off the cloth, he broke up laughing before he could ask the question. Meriwether had glued a small, ticking clock over her navel - set to the correct time, of course.
Trivia: Before the series went on the air, Gene Roddenberry expressed concerns about the sound effects in Star Trek's intro. He wondered if the "swish" effect of the passing ship should be removed, since there's no sound in space. Desilu Studios polled preview audiences about it; the majority said they liked the effect because it conveyed great speed, and that the scientific inaccuracy didn't bother them. So the "swish" was allowed to remain.
Trivia: Don't know if its intentional or not? This is the only episode of Star Trek, (the Original Series) that I know of, where a person makes a sound after being stunned by a phaser. As Kirk and crew stun the group of men with pipes, listen carefully as the last one falls to the ground. He makes a "oh-ah" or groaning sound. After reviewing all the episodes prior and after. This is the only person who makes any kind of noise after being stunned. Maybe it was the parasite infecting his body that allowed him to do this.
Trivia: A perennial Star Trek extra, the tall blond Eddie Paskey played a red-shirted crewman standing in the background in virtually every Trek episode for all 3 seasons. He rarely had any lines, and was even killed off in "Obsession," but was back on duty anyhow in the following episodes and for the rest of the series.
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.
Trivia: A constant question during the run of all the Trek series is why Klingons look so much different, from "Star Trek: The Motion Picture" on, than they did in the original series. The real reason is the movies and later TV series had a better makeup budget. However, the "Star Trek: Enterprise" episodes "Affliction" and "Divergence" provide a canon answer. Klingons acquired genetically engineered human embryos left over from Earth's Eugenic Wars and used them to augment their soldiers. It worked but created a virus that threatened to annihilate the Klingon race. Dr. Phlox and a Klingon doctor found a cure, but it resulted in all Klingons becoming far more human in appearance. Sometime between these episodes and the first Trek movie, a cure was found, returning the Klingons to their present day "ridged-head" appearance.