Sarah wires up the cabin door to cause the T-888 to reboot. She is asked by the Fields how she knows that the T-888 will come through the front door and she tells them they always come through the front door. In Fact, in the movie Terminator, the T-101 comes for her at her shared apartment with roommate Ginger. The T-101 enters through a sliding door and not the front door at all. So not always just typically.
When Lauren points a revolver at Ms. Connor, the revolver can be heard cocking. However, the revolver is not cocked.
Cameron comes through a window and is motionless and unresponsive for a while. There is no apparent reason for this, as the terminator she is fighting is very far way, and we later see him walking down the road toward the house.