Factual error: The 2 C-class Mercedes Benz' they have in the CIA compound are the newer body styles that came out the year they were filming the movie. The Benghazi attack happened in 2012, the C-class had a different body style then.
Continuity mistake: At 8:40 PM on September 11th, the sun has not set. The sun would have set over an hour before on that date. In fact, the sun would never be shining that late; sunset on the longest day of the year is around 8:20 PM. (00:39:38)
Factual error: The movie is set in 2012. The S class Mercedes has a stereo camera as a sensor for advanced driver assistance systems, only introduced in 2013.
Other mistake: During the scene when Jack's wife is ordering at McDonald's, the little girls are mouthing the lines as the others are saying them.
Factual error: Sean Smith is shown playing "Call of Duty: Advanced Warfare" on an Xbox. That game was released on November 4th, 2014, over two years after the date of the attack (September 11-12, 2012).
Suggested correction: It was Modern Warfare being shown on the TV. Advance warfare uses exo suits and can't be missed.