Factual error: In the scene after the attack begins and military assets are spinning up to go help, when they briefly show the SOC guys loaded into a transport aircraft they all look operator-ish and have high cut fast helmets, but are carrying M16A4's with no optical devices mounted. I don't know of any SOCOM units that wear fast helmets but are issued A4's without an ACOG, ELCAN, aimpoint, etc.
Continuity mistake: When the G.R.S. team is on their day off (9/11 anniversary), Tanto is seen video chatting with his wife. In the frontal shot of him, he's using a Samsung smartphone, but in the next shot, it changes to a Blackberry. This is done multiple times throughout the scene.
Continuity mistake: More than halfway through the movie, the "Americans" set base at a really nice house. They get attacked several times while at that house. Every time the "Americans" get attacked and people died, there aren't bodies lying around the next time they get attacked, and no-one removes the bodies either.
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.
Visible crew/equipment: After leaving the Ambassador's compound and returning to the Annex after Ambassador Stevens decides to stay at the compound, Rone is asked how did it go, where he replies "He's a rock star. Everybody in Benghazi knew he'd be there" and walks indoors. Whilst Rone walks through the doorway, the reflection of the camera and cameraman can be seen reflected in the glass pane of the door as the camera passes by.
Visible crew/equipment: At 12:17am, after the police car slows down and speeds back up in front of the Annex, Rone says "Oz? This is where we make our stand." Whilst Rone is talking, the camera is panning down on Oz who is keeping watch and the shadow of the camera can be seen cast on the top of the wall towards the left of shot.
Visible crew/equipment: When the Annex is being invaded by the Tangos, one of the GRS team members is shown running across the courtyard whilst Oz, off-screen says "We got about 25-30 Tangos." About a second before the shot ends, the shadow of the camera can be seen cast on the wall of the building whilst the man is running and is then cast on a tree in the foreground of the shot.
Factual error: Toward the end of the movie there is a shot over the Mediterranean Sea with the sun rising. The shoreline at Benghazi generally runs northeast-southwest, meaning the point of view would be somewhere between these two directions. If we assume that the point of view is generally straight out to sea, this would make the point of view northwest.
Continuity mistake: In the beginning scene when Jack Silva is being picked up at the airport he's shown getting into the range rover in a blue button down shirt, sport coat and blue jeans. When they return to the CIA annex he exits the vehicle in khaki cargo pants and a lighter button down shirt. His bags were placed in the rear cargo area of the vehicle, tier 1 operators would not stop in a hostile environment to change clothes.