According to producer Erwin Stoff the diplomatic compound as well as the CIA annex were built using the actual plans. Stoff: "...what we did is we had actual plans and satellite images of the original structures, and we had the guys. So we (...) built these, we replicated both the annex and the diplomatic mission exactly to the inch..." 
In a January 18, 2016 interview on the Mark Levin radio program, Mark Geist said he sneaked in during filming and took the place of the actor Max Martini portraying him. Michael Bay didn't notice until Mark looked at the camera.
Michael Bay wanted to shoot on film. Director of Photography Dion Beebe wanted to shoot digitally. Bay ultimately accepted digital filming because of the number of night scenes and the tight production schedule.
According to Mark Geist in a January 18, 2016 interview on the Mark Levin radio program, the mortar rounds that hit the roof had a kill radius of 21 feet, meaning anybody within 21 feet of a round was as good as dead.
Michael Bay said he was attracted to the project because he had used military veterans in all of his films, as both actors and technical advisors, and felt he would be uniquely qualified to tell their story.
The opening text says virtually all foreign embassies in Libya closed. The embassy of Malta, Libya's northern island neighbour (and an EU member state) stayed open throughout this period. Malta is also where much of the movie was filmed.
Michael Bay said that filming in Malta he used a film crew he'd never used before. Bay claimed that an international crew working so well together telling a story centered on Americans was a tribute to the universality of the story.
During the morning prayer scene, an aerial shot of a mosque tower is shown. This is the exact same shot used in Blackhawk Down when they were showing helicopters flying around the city of Mogadishu blaring that they will not leave Mike Durant behind.
Sean Smith was an avid gamer. His favorite massively multi-player online role-playing game (MMORPG) was EVE Online, where he attained almost legendary status as the character "Vile Rat." His death resulted in several community tributes online.