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.
Factual error: When the analysts at the CIA Annex are discussing where the GRS operators are, the map they are looking at is not the actual Benghazi compound.
Continuity mistake: During the first firefight with GRS at the CIA annex, Oz is firing and it pans in front of him, where we see his Night Vision Goggles have been hit and broken in half. The next shot is when he gets shot and shows his goggles getting destroyed.
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.
Visible crew/equipment: When the G.R.S. team drive to Chris Stevens residence, they encounter a road block; one of the cars being a pickup truck with a machine gun (commonly called "Technicals"). In several rear shots from behind it, there is a camera and operator on the edge of the hood. The cameraman is covered by a black sheet to make it difficult to see him.
Continuity mistake: When terrorists start to attack the Ambassador's residence, Chris Stevens is seen putting on a black plate carrier vest. The one he is seen putting on has a cummerbund which lifts up to open. However, in the next several shots and until he isn't seen again, he has a side opening vest, which is actually an IBA (Interceptor Body Armor). This armor opens like a flak jacket by pulling the left flap.
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.