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This episode, shot in 1964, featured guest stars William Shatner and Leonard Nimoy. It marked the first time the future Captain Kirk and Mr. Spock ever appeared on screen together. See more...
Factual error: Solo blows open the ceiling vent of Illya and Marion's cell, and she stands on Illya's shoulders until Solo can reach her and pull her out. This leaves Illya with nothing/no one to stand on, no way to reach the vent and no apparent way out of the cell. But he's out just the same in the next scene, with no explanation as to how.
Factual error: Ole and all the Thrush baddies call the missing chemical component a "catalyzer," repeating the term throughout the episode. This was a scriptwriter's error, which only David McCallum, to his credit, corrected: he had Illya say "catalyst," which is what the writer meant. "Catalyzer" isn't a word.
Revealing: Every time the villains' deadly gas, "hydro," is mentioned, the word is badly and very obviously dubbed in, and doesn't match what the actors' lips are saying. This occurred because the original name used, "freon," turned out to be an existing (and patented) refrigerant gas, so the name had to be changed to avoid a trademark lawsuit.
Continuity: At the end, Solo and Illya are sitting at a small bistro table as the captured bad guys are marched past them. Solo wears a green fez, and between shots, Illya suddenly acquires a red one. It wasn't in his hands or on the table before that: it just seems to appear on his head out of nowhere.
Plot hole: U.N.C.L.E.'s pen communicators worked much like modern cell phones: when one agent called another, they "rang" with a 2-tone signal. For some reason in this episode, Solo's pen, which isn't on an open circuit, transmits Illya's voice without ringing first. It signals normally a few scenes later, though.






