1. He overcomes PTSD in two scenes. The filmmakers say it's a character piece but the main emotional issue is glossed over.

2. Mustafa was a made up character who became a huge motivation for Chris Kyle. And I think that takes away from the fog of war (anyone could be a foe; it's not just about killing one guy) and the fact that he was out there trying to protect his fellow troops, not kill one dude.