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Trivia
Shari Lewis, who appears in this episode as Janet Jerrod, is the creator of the sock puppet Lamb Chop, which she voiced on various children's shows from 1956 until her death in 1998. 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.
Continuity: In Waverly's office, Illya hones his combat skills by swinging at a suspended wooden block with a baseball bat. When the alarm goes off, Illya puts the bat down on the table, and he and Solo rush to the computer console. In the next, reverse angle shot, the block is still hanging from the ceiling, but the baseball bat has vanished from the table.
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.
Revealing: When Napoleon Solo arrives at the train station, both the name of the newspaper the man in black is holding, and the name on the station sign are backwards. Additionally, as he arrives by train the man in black is on the left side of the shot. After exiting the train, the man in black appears from the right side of the shot.
Plot hole: The typewriter case containing the secret plans is said to be boobytrapped with nitroglycerine. If dropped, says the Thrush agent, it "could blow us all up." Yet it survives a plane crash intact and is later wielded as a club several times in the cavern fight scene, and somehow it never explodes.






