Factual error: During the first tunnel sequence, all the cars travel very far into the mountains, turn lots of corners, yet not only is Gisele still able to speak to them over the radios, their GPS still works. GPS signals invariably need a clear 'sight' of the sky and can penetrate light cover, but most certainly not that depth and cover. (00:58:05)
Factual error: In the scene depicting life on Baker Street (after the "Sherlock Holmes" title), a horse-drawn carriage races through the streets of London. The only problem is, the carriage is driving on the right side of the road with others passing on the left. In England, carriages would be driving on the left. (00:07:05)
Factual error: In one scene, focused on a period wood-staked pickup truck parked on the street, you can see clearly a modern Jeep Grand Cherokee parked on the other side of the street.
Factual error: When the group discovers the armoured truck in the woods, the officer says it's from the 1950's. After they open the door and are looking at the money, it looks brand new. Money sitting in the weather and heat would get mouldy and deteriorate after 50 plus years
Factual error: When the guys first set up the website to accept submissions, the year is 1997. We see a shot of the computer screen which displays that they are running Windows XP, which wasn't released until 2001.
Factual error: When the elevator falls to the ground it passes a hotel waitress and blows her hair and pieces from her trolley away. In fact the wind gust comes after the elevator has passed, in reality it would come before it passed, as the air ahead of the elevator would be compressed and blown outwards, leaving lower pressure behind which would cause a gust inwards.
Factual error: During one of Blomkvist's flashbacks to his childhood with his babysitter (about 40 years ago), he is wearing Lightning McQueen shoes.
Factual error: The part of the movie where they have had the morning updates at the police station, Richard Gere later walks on the sidewalk and stares deliberately at a pair of Muslims praying. The sun is shining on the backs of the Muslims heads indicating that they are facing west even though Mecca would be off to a much more easterly direction from Brooklyn.