As Matt, Karen, and Foggy are being escorted to the District Attorney's office, they are first followed by one guard with an AR15, then after the camera switches to behind them the same guard with the AR15 and a guard with a shotgun, and then the view switches to front again and both guards have AR15s.
When Karen first looks toward the door of her apartment after hearing a noise in the hallway, the door is only about a quarter open, but when she looks back a moment later after getting out her gun, it is more than half ajar.