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Factual error: The date for the solar eclipse is given as Wednesday, June 2, 1882. There was a solar eclipse in Africa that year; however, the date was Wednesday, May 17, 1882.

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Continuity mistake: The entries into Quartermain's journal are supposedly covering events during 1881 and 1882. The entries consist of a day and a date, but no month. Taken in order, they cannot fit into the 1881-1882 calendar. For example, the two entries immediately before the June eclipse can only be in August 1882.

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Show generally

Factual error: The group finds an underground sea and there is a flock of pterosaurs flying overhead. The professor identifies the pterosaurs as the missing link between pterodactyls and archaeopteryx. This is not true as archaeopteryx (and other birds) did not descend from pterosaurs but from a branch of theropod dinosaurs.

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Show generally

Continuity mistake: The professor knocks a hole in the side of a tunnel and hot water and steam gush out. The group is then distracted by a boulder traveling through the tunnel. After the boulder passes, there is no longer any steam or water gushing from the hole in the wall.

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Other mistake: Christina suggests that they have found Atlantis. However, they start in Hawaii, which is in the Pacific. The general consensus is the Atlantis is in the Atlantic (or Mediterranean) and not the Pacific. Some people do suggest that the lost continent of Mu is in the Pacific.

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Trivia: For many years, this was considered to be a lost movie.

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Character mistake: The professor identifies the "sea monsters" as plesiosaurs from the Pleistocene. Plesiosaurs became extinct at the end of the age of dinosaurs, nearly 60 million years before the Pleistocene. Of course, the Loch Ness Monster might be an exception.

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Factual error: One of the women in the group picks up a piece of calcite (Iceland Spar variety). It is obviously calcite because of the very obvious rhombohedral cleavage and other visual indicators. The sample is later identified as ringwoodite. Ringwoodite is cubic with no reported cleavage. Even if it did exhibit cleavage, it would not be rhombodedral.

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Factual error: There is an explosion in the laboratory supposedly because the professor's assistant added too much aqua regia. Aqua regia will do a lot of things, but in an open furnace it will not explode.

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Character mistake: Trevor tells Sean to "eat his trilobite to keep his strength up." However, Trevor, a geologist, pronounces trilobite incorrectly as "TRIL-o-byt" instead of the correct pronunciation "TRY-luh-byt." The name derives from the fact that the creatures have 3 (tri) lobes. Tri - for 3 not Tril - for 3.

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Factual error: While magnesium is the seventh most abundant element in the Earth's crust, it never occurs naturally in the uncombined state because it is too reactive. Therefore, there are never veins of magnesium metal to be ignited. Magnesium metal (uncombined state) will burn if ignited.

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Factual error: Diamonds, emeralds, and rubies do not occur together, they form under very different conditions.

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Continuity mistake: Many times, especially in the second half of the movie, the background color changes between shots even in two shots of the same set.

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Factual error: In the movie version during a series of shots of African animals, there is a shot of a tapir. This is incorrect as tapirs are not indigenous to Africa. This is probably also present in the serial version. (00:09:45)

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Factual error: The gold sarcophagus is pulled from a pool of mercury. This is not possible because gold, like many metals, dissolves in mercury. All the gold would have dissolved.

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Factual error: There are several repeated shots of a wild tiger roaming Africa. Tigers are not native to Africa.

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Factual error: During the meeting concerning Godzilla, one of the scientists incorrectly states that the Jurassic Period was 2 million years ago. The Jurassic Period lasted from 180 to 135 million years ago. (00:29:40)

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Trivia: Liberty Valance's last poker hand is, appropriately, aces and eights. (01:30:10)

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Continuity mistake: When the state trooper examines the letter, the is no stamp. However, when Charlie Chan (Sydney Toler) examines the letter, there is a stamp present. (00:43:10)

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Continuity mistake: The policeman drives up to the house and parks his motorcycle facing the front door. He goes to the door to talk and then returns to his motorcycle and prepares to leave. When he gets back to the motorcycle, it is now parked facing away from the door. (00:08:05)

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