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Factual error: Narration refers to Hitler's Germany research into nuclear fusion - it was nuclear fission they were looking into, the same as what fueled the WWII-ending bombs in Japan, and every nuclear bomb and missile since. No nation has been able to generate nuclear fusion until very recently, and it doesn't produce an explosion - which is what Hitler wanted. (00:08:35)

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Factual error: When they come upon the nuclear reactor cooling towers there's a wide shot that reveals there are no electrical lines anywhere near the reactor. A reactor's central purpose is to generate electricity - all "real" (non-CGI) reactors are surrounded by electric power lines and transformers. (01:20:23)

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Factual error: In the subplot on earth, the heroes' family members are trying to outrun the falling moon's gravity that's sucking everything into the air. So, naturally they duck into a barn, because, of course, gravity can't affect you behind a wall. And sure enough, behind the wall, they're suddenly safe.

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Factual error: A utility pole appears in a scene, with electrical, telephone, and CATV (cable TV) lines. Although rudimentary cable TV systems existed in the movie's time period (1951), the 1/2" or 1" shielded cable shown in this scene didn't appear in use until the 1960's. (00:45:08)

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Factual error: The car bomb meant to kill Gray and Darby is connected to the ignition switch. The ignition switch has done its job (switched on) when the starter motor starts turning, and we hear the starter motor turning when Gray turns the key. The bomb would have exploded at that point - it doesn't matter at all that the engine hadn't started yet when Darby stops Gray from continuing. (01:55:50)

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Factual error: Ann plays an organ in a church with no electricity. And no, there was no manual bellows to make it work; the movie makers simply didn't know the difference between the operation of an organ versus that of a piano.

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Factual error: In one of the intertitles in the final scene when Mendez is lying in his son's bed, it is stated, "The involvement of the C.I.A. complemented efforts of the Canadian embassy in freeing the six held in Tehran." The six freed from Iran by Mendez were not being held; they were in hiding. The hostages that were held were freed by Iran much later. (01:50:39)

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Factual error: After the car explosion in front of the Vogue theater on Hollywood Blvd, Murtaugh tells Riggs that "he's headed for the freeway" and "you can cut him off at the 3rd St bridge" (approximate wordage), and Riggs takes off running. 3rd St is nowhere near Hollywood Blvd (17 blocks away) and there is no 3rd St bridge within miles.

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