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.
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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.
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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.
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Trivia: For a lot of the first few seasons: When it was time to officially shoot the episodes, William Shatner would be late getting to the set, and when he finally showed up, he was drunk! But no one could really stop the filming to wait for him to be sober, so they would film the episode with Shatner in a dramatic tone (he never spoke that way on purpose, he was just so drunk he didn't realize how he was talking, and that's why it's become so infamous today).
Trivia: Throughout the series, planets are given a Class rating, most commonly "Class M", suitable for humans. The M is never defined in this series, or TNG, but in Star Trek: Enterprise, S1: E3 "Strange New World", T'Pol says the new planet is "Minshara Class", meaning suitable for humans. Therefore, the classifications for planets used by the Federation were probably determined by the Vulcans.
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