Factual error: In the first scenes, when US Soldiers are attacked, the EOTech Aiming Device on one soldiers Rifle is mounted backward, e.g. looking towards the soldier, not the enemy.
Factual error: When Leonardo DiCaprio is arriving on the tarmac at what is supposed to be Abu Dhabi, the main (and very distinctive) Dulles airport terminal is visible in the background.
Factual error: When calling for support in Balad, Ferris' partner gave the coordinates in latitude and longitude. The U.S. military only uses and recognizes MGRS (Military Grid Reference System) coordinates. Instead of "North 34 degrees, 20 minutes, 16.8 seconds; East 44 degrees, 24 minutes, 14.4 seconds", the quote should have been "38S MC 45179 99794".
Factual error: In the first scenes of the movie, when the SWAT team raids the house of terror suspects in the UK, the tactical team waits to move in until a passenger train passes by the neighborhood. The train is an Amtrak train and not the type of passenger train that runs in the United Kingdom.
Deliberate mistake: The helicopter camera shot of buildings under construction in Dubai plays backwards, to achieve a better effect. It's given away by the traffic on the ground traveling backwards, trucks make this particularly obvious.