Factual error: The term mayor of Paris was abolished from 1871 till 1977. But we see Victor Maynott wants to join the mayor campaign in 1910.
Factual error: During the sleepover in the tent Dennis gives the girls M&Ms to snack on. If you look closely you can see one of the girls eating a blue M&M. These didn't hit the market until around 1995, a full 7 years after this movie takes place.
Factual error: In the climax of the movie, Nicholas Cage uses a nail gun like a marksman, hitting with precision the bad guy that holds his wife tight. Besides this skill of his coming out of left field, a nail gun does needs a surface against the opening. It does not shoot nails in the air without pressure being applied, it's a Hollywood trope. (01:18:45)
Factual error: In the scene where Jack Black is kneeling over Shirley MacLaine's body in the garage, you can see the outline of his smart phone in his pocket.
Factual error: The movie takes place in Stamford Connecticut (per locations and is shown on cop cars). Eva buys a bottle of wine in a supermarket, but in CT only beer can be purchased in a supermarket. (00:25:15)
Factual error: In the scene where Nathan and Lily's location is tracked online when chatting, it's evening in the USA and already dark sometime before dinner - yet the tracker calls his boss in London, England and it's daylight. Time-wise this is not possible.
Factual error: Immediately after Eddie surfaces following his dive, he rests with his head well above the water. Had he actually been in water deep enough for the dive, he would have floated with his chin about even with the surface.
Factual error: In Sam's premonition, when Isaac is still in the bus when it is falling down to the water, he is at the front of the bus. In reality the falling force should be pushing him to the back of the bus.
Factual error: During the pre-credits sequence, when the Driver is attempting to escape the police, the sound of the engine accelerates with the rhythm of a manual transmission while the model on the screen has an automatic transmission.
Factual error: The movie's final scene spectacularly shows planet Melancholia colliding with the Earth, causing the destruction of the planet and everybody dying. The problem is that, in reality, tidal forces from Melancholia would have at a minimum caused extreme natural disasters when the planet made its first pass of Earth. When it turned around to come back (another mistake in itself considering powerful gravity forces would have been needed to cause the planet to do a 180 to hit the Earth), entering Melancholia's Roche limit would have destroyed all life on Earth before actual impact and may have torn the Earth itself apart before the actual collision.
Factual error: The wolves in this movie must be some sort of mutant super wolf. North American Grey wolves are not lion sized killing machines. They are typically smaller, by weight, than an average German Shepherd.
Factual error: In the last scene the ICE Train is leaving the station eastbound. It is not possible to enter these trains at the central station because all eastbound trains end in Berlin and have only one station left (Berlin Ostbahnhof). Every ICE leaving Berlin is going in the other (westbound) direction.
Factual error: A Great Gray Owl is depicted living in the George Washington National Forest. However, this species is not native to Virginia.
Factual error: The character Peter has a modern haircut that would not have been found during medieval Europe; his hair defying gravity despite being a time without hair gel.
Factual error: During the end where the girl gets her phone back she has a text. However inside a submarine with the hatch shut there is no way for a mobile signal to get through.
Factual error: In the film Hanna talks about there being 8 planets. the film also suggests that Hanna and her father have been living in the forest for her whole life of 16 years and her only knowledge coming from books. it was 1996 when the government had any traces of Hanna's father, so that makes the film set in 2011/12. so if she has only ever got her information from books published before she was born, she would still think there are 9 planets, because Pluto wasn't officially named a dwarf planet until 2006. (00:16:05)
Factual error: Jack and Jill claim to be identical twins, but it is impossible for a male and female to be identical twins. They must be fraternal.
Factual error: In the very last scene, Mikael and Erika get into a taxi and head off. This is on Bastugatan in Stockholm, and they are heading west. Bastugatan is a one-way road, and you can only go east. (Go to Bastugatan 14, Stockholm, Sverige and look west, the scene is very distinctive, as is the Do Not Enter sign.)
Factual error: When Robert Kennedy receives news about his brother John's assassination, he is in his office at the Department of Justice. RFK was actually at home eating lunch when he received that phone call.
Factual error: During scenes set in the early Noughties (one of Dex and Emma talking on a rooftop at night, and another of Dex crossing the river on a bus), modern buildings are shown on the skyline, including the Heron Tower (2009), the tallest building in the City at the time of filming, but it didn't exist at the time the scene is set.