Factual error: The radar guided SAMs are consistently evaded/triggered by the pilots' flares, which in reality only work against heat seeking missiles. Radar guided missiles would be defended against using chaff, basically clouds of aluminium foil strips. It was mentioned in some interviews they didn't want use chaff as it wouldn't really be visible for the audience - hence why they only deploy flares.
Factual error: The pub sign states "whisky" - Irish whiskey is always spelled with an E.
Suggested correction: Persse's Whiskey Company of Galway (named on the sign) used the 'Scotch' spelling on advertising mirrors and bottle labels.
Factual error: In the flashback where Otto gets on the train with Sonia, you can see the familiar Pennsylvania Railroad red keystone logo on the side of the railcar (or engine). The scene is approximately year 1972 (born 1955 from tombstone; Army physicals were age 17/18), and stated as in Pittsburgh. His ticket was $1.10, implying a short ride. But PRR ended commuter service in Pittsburgh in 1964. Moreover, PRR was merged into NY Central in 1968, so by 1972, the logo would have been Penn Central's green "PC."
Factual error: On July 4, Kya waits for Tate, watching the sun set and the fireworks at night. She falls asleep on the shore and wakes up in the same position, watching the sun rise. So the sun sets and rises in the same position. (00:55:40)
Factual error: Lieutenant Hudner comments that he went into the Naval Academy right after Pearl Harbor. Pearl Harbor happened in December 1941 and he couldn't have gotten into the Naval Academy until 1942. Then he says, "The war ended a month before he graduated." The Naval Academy is a four-year school. That means he wouldn't have graduated until 1946, a year after the war ended.
Factual error: A .22 shot would be 120-140 dB, muffled with a pillow down to 100-120 dB. Only one person heard the second shot? No one heard the third? Plus at the end there's no way a .22 could pass through a male chest cavity, and halfway into a female chest cavity - it's too low power.
Factual error: The parachute flare was not invented till 1922. This film takes place in 1918 but features one. (00:21:15)
Factual error: One of the warriors tells a trainee they move like a sloth, more than once. Sloths are only found in the "new world", not native to Africa.
Factual error: During the ship scene, the computer graphic of splicing bat DNA into human DNA is wrong. DNA strands are complementary to each other. If you remove a segment from one side, what you can put back is predetermined by the other side, regardless of the source (bat, elephant, fish, etc). The graphic should have shown both sides of human DNA replaced (or just added) by both sides of bat DNA. As it is in the movie, the injection should not have any anatomic/physiologic effect.
Factual error: Pettis' calculation of the amount Connor needed to replace his asset was way off. He stated, "[Cornell] brought me about 250 [$250,000] a year. He had at least 20 more years of service. Subtract five years he might have spent in prison, so you owe me, what? Six point two million." Pettis was presented as intelligent, but a quick mental calculation of even the full 20 years at $250,000 would total only $5 million (not $6.2 - an odd sum). For 15 years, the total would be $3,750,000. (00:28:45)
Factual error: The nuclear missiles are shown in flight numerous times. They're travelling horizontally, and have their rocket motors on. Except that long range nuclear missiles are ballistic, and follow a curved path to and from space. And their rocket motors are on only for the thrust phase of the flight, and not halfway to the target.
Factual error: In a scene with Elvis and Priscilla set in 1959, "Can't Help Falling In Love" is playing in the background. That song was released in November 1961.
Factual error: Twice during the movie, streetlights are visible: once when lady Russell informs Anne of Wentworth's engagements, and once while Anne is running after Wentworth. (Streetlights, lit by gas, were indeed conceived during the regency period - but they were experimental curiosities, and certainly not yet installed nationwide).
Factual error: When they were driving away from the bar, neither Zoe (driver) nor Breslin fastened their seatbelts. Seatbelts are mandatory in New York for the driver and passenger (s) and failure to "buckle up" is classified as a primary offense, meaning no other violation must be observed before police can stop and cite violators. (00:57:25)
Factual error: Early in the movie, the Predator is standing still while cloaked as an ant crawls across its leg. A rat grabs and eats the ant, then a snake strikes the rat. The snake starts to crawl away, then suddenly senses the Predator and gets startled, rattling its tail. However, rattlesnakes are pit vipers. They see heat. So even cloaked, the snake should have already seen the Predator standing there and known. Predator cloaks do not cloak from heat vision. (00:13:30)
Suggested correction: If you watch closely, the rattlesnake is initially distracted by a mouse. However, as the predator moves closer (even while cloaked), the snake becomes agitated and rears up in a defensive "S" posture. The reason the snake doesn't strike immediately isn't necessarily that the predator is hidden from its heat vision; it's that the predator is a giant, unfamiliar heat source that isn't moving aggressively yet. The snake is essentially "sizing up" a massive predator it can see perfectly well.
That is not how pit vipers behave. Unless the predator would be behind glass, it would be aware of body heat coming from it, and as a larger source than that rat, it would be defensive. It is in captivity where the feeding response can override this, as seen by handlers. But not in the wild, where the snake would not be used to a large heat source providing food.
Factual error: Norma Jean's mother is driving away from the house onto the street. She turns left and crosses a yellow dividing lane in the middle of the street. It is supposed to be 1933. But these yellow dividers did not come into existence until the 1950's.
Factual error: Rose's legs were paralyzed, but when she was dragging herself on the floor, she occasionally used her feet to help propel her body forward (and moved her feet downward) - something she would not be able to do if her legs were paralyzed. (00:33:40)
Factual error: It's winter in Montana, yet there are rattlesnakes out in the cold.
Factual error: Posters and banners for the fall harvest festival are printed in full color. This would never have happened during the depression in rural Virginia.
Factual error: A major plot point revolves around the fact that the police and medical staff can't reach the island because the "Pisceshite" dock is non-buoyant and they need to wait for the low tide. While we do not know exactly where the fictional island is, other than the fact that it's 2 hours off the coast of Greece and Blanc mentions (correcting Miles Bron) that it's in the Aegean sea and not the Ionian sea, it's fair to say that the tides in that area of the Mediterranean are negligible, not reaching even a meter in very selected spots, and averaging at mere centimeters. It's nothing that would impede navigation and police or medical team to arrive. (01:02:30)