When the swat team is ready to enter the cabin, you can see two swat members put their backs to the wall right next to the front door which is open. It is barely visible, but you can see the door latch on the inside of the door frame and a sliver of black from inside the cabin. In the next scene they breach a closed door.
An Army colonel would never refer to incarceration as 'the brig'; that is strictly a term used in the Coast Guard, Marine Corps and Navy. A military jail or prison is referred to as "the stockade" in the Air Force and Army.
Andrew Elvis Miller (Butch)'s wireless microphone belt pack falls off of his belt and dangles by its cord as he runs after the SUV in the opening scene.