Factual error: The inspector is suffering from thallium poisoning. However, everyone is using various radiation detection methods to detect the thallium. Natural thallium is not radioactive. Of the artificial thallium, the only with a half-life long enough to last long enough to pose a problem is too weakly radioactive to be a significant hazard.
20th Sep 2021
28th Nov 2020
Factual error: The trip goes back 65 million years. This is the late Cretaceous period. The Allosaurus was a Jurassic period dinosaur, which became extinct before the beginning of the Cretaceous period. Granted, the Allosaurus was probably the most powerful predator of its time, the events in this movie take place long after the time of the Allosaurus.
30th Jun 2020
3rd Jan 2020
Factual error: A few drops of acid are dropped on a penny and the liquid bubbles (colorless liquid) as the acid eats its way through the penny. The penny is mostly copper. Any acid that can react with a copper will also produce a bright green to bright blue solution of dissolved copper, which is not the color seen. (00:05:20)
Factual error: Spoiler. Police Sergeant Keeley tells Poirot that Doctor Grainger died of carbon monoxide poisoning. The killer turned the natural gas in the bedroom and did not light the heater. This would result in the room filling with natural gas, not carbon monoxide. (01:17:30)
Factual error: Poirot smells and very carefully tastes a drink and says, "Potassium cyanide." It is impossible to distinguish between potassium cyanide and sodium cyanide (the other common cyanide) by this method. In addition, there are another less common cyanides that would smell and taste the same as potassium cyanide. (00:16:01)
Factual error: Lily looks over part of the procedure for the manufacture of Astroprene. There are several problems with the chemical structures shown in step two of the procedure. This step appears to be a simple acid catalyzed rearrangement of the molecule shown. The procedure should begin with a C inside the hexagonal ring and end with the C outside the ring with no other changes. The errors include, among other things, a carbon atom at the lower left of the ring with two lines (bonds) to it. The C should have four bonds (lines), the two shown plus two to hydrogen atoms (H). The bonds to H may be condensed so the C will look something like -CH2 - (the 2 would be a subscript). (00:10:30)
5th Nov 2019
Factual error: Lord Pearson takes the mineral sample and says it can be converted to 24 Karat silver. Karats are only for gold, with pure gold being 24-Karat gold. Pure silver is 1,000-Fine silver. In addition, the subtitles say, "24-carat," with carat spelled with a "c" not a "k." Carat is a weight measurement normally used for gemstones. Both silver and gold are normally weighed in Troy ounces (about 156-carats) not carats. A sample that weighs 24-carats has the same weight (4.8 grams) not only for diamonds, but also for silver, gold, and cow pies regardless of the purity (be it Karat or Fine). It is possible that Lord Pearson meant 24-carat silver; however, a mine that only produces 24-carats (about 0.15 Troy ounces) of silver is not commercially viable. (00:10:57)
28th Oct 2019
17th Oct 2019
28th May 2019
Character mistake: A priest is holding a globe with a fire to light the globes carried by others. There are two lines with globes approaching the man with the lit globe. The first person in the line from the right has trouble lighting their globe. She starts to return for a second try, but apparently thinks better of it and continues on with the unlit globe.
28th May 2019
15th May 2019
Factual error: There is a view of the night sky in southern Africa. However, both the Big and Little Dippers (along with Polaris) are visible. In general, these constellations are not visible in the southern hemisphere, and where they are (North of 1° South latitude) they are very close to the horizon. The Big Dipper (Ursa Major) is to the left of the screen and Polaris (part of the Little Dipper = Ursa Minor) in near the top-center. This occurs shortly after the lion cub scene. (00:44:00)
10th May 2019
10th May 2019
Other mistake: In the opening credits the following is posted "Screenplay based on Rider Haggard's Allan Quartermain" The author's name is usually given as H. Rider Haggard (H. For Henry), and Haggard's hero was named Quatermain (1 "r" not 2). This misspelling of Quatermain appears in many movies.
6th May 2019
Factual error: The movie takes place during or shortly before World War I. At one point, Quatermain and Jessie find a German base. Thus, they are probably in one of the pre-World War I German African colonies (Probably German East Africa or German South West Africa). There is a red, white, and blue French flag flying over the camp instead of a German flag.
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