Director John Moore was nearly killed while operating the camera for the shot where the tank busts through the wall. He was pulled out of the way by stuntman Jimmy N. Roberts just in time. This take was used in the movie, and Moore's being pulled back is why the shot suddenly shakes.
Owen Wilson separated his shoulder doing stunt work on the movie. He was back the next day shooting action sequences.
Director John Moore says about the SIG-Sauer SSG 3000 sniper rifle: "We went to great pains to get that. It's one of the better sniper rifles in the world."