Deliberate mistake: When the Russian tosses a grenade toward the wood pile when Fitz-Hume and Millbarge are, Fitz-Hume catches it. Trouble is, he is looking up, as if expecting it, when anyone else would be hunkered down. Then when he tosses the grenade back, it's in a manner that would give it a high arc. Instead, it flies straight into the window of the building.
Plot hole: When Fitz-Hume and Millbarge disguise themselves as aliens in order to distract the mobile launcher crew, where exactly did they get the foil they are wearing? Except for the satellite dish Millbarge wears on his head, no parts of their code transmitter can have been used or the thing would be of no further use, and it is very unlikely that either of the two spy groups brought any of the foil along.
Trivia: Another notable cameo appearance is made by the special effects legend Ray Harryhausen in the role of Dr. Marston.
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