Names of the real SEAL team members' were changed in the film to protect their identities as some are still serving in the military or preferred to remain anonymous. The only names that weren't changed in the film are: Ray Mendoza and Elliott Miller.
The smoke released from the IED explosion was filled with phosphorus. This meant the real life Navy SEALS in particular the character of Erik almost lost his voice. The phosphorus in the air burned his esophagus lining. The burning phosphorus was also embedded in Elliott and Sam (Joe Hildebrand) who had pieces of phosphorus removed from their leg days after the incident.
The film plays out in real time starting from the title drop. At that point forward, the run time depicts the real duration of the mission itself.
Staying true to the film's philosophy, the cast's weapons training was so comprehensive that if something went wrong during a scene-like a machine gun jamming-the actor using it would know exactly how to drop to a knee and fix the issue, all while the other actors continued shooting around them. This level of training enabled the cast to respond organically and instinctively throughout shooting the film.
The film is based on the memories of each SEAL team members present during the mission. Each scene in the film was corroborated by at least 2 or more of the SEAL team members interviewed by Ray Mendoza and Alex Garland.