Continuity mistake: When John and Catherine are in the hangar at the runway, the Cessna's tail number is N3035C. When the plane is shown in the air, the number is N3973F. When they land, the tail number has changed back to N3035C.
Continuity mistake: In the cemetery scene when the Terminator uses a bazooka to fire a missile at the TX, the shot that shows the TX being launched up in the air and hitting a gravestone should have shown the car used by the TX and the road where the car was parked. In the next shot, when the TX gets up and starts to run after the hearse, the road reappears but not the parked car.
Continuity mistake: When the T-850 walks around at the gas station, shopping, he fills up the shopping basket, and one of the bags of chips can't fit in the basket. However in the next clip, the basket is half empty and there is plenty of room for the two boxes of candy he grabs at the counter.
Continuity mistake: JC's leg was crushed by the T-X. After emerging from the elevator, he limps on the wrong leg.
Continuity mistake: In the scene just after Kate Brewster's dad has been shot he says to go to his office. On the way there you can see his jacket is undone and you can see his shirt and tie. Yet when they enter the office it shows him sitting down with his jacket neatly buttoned up. For a guy who just got shot and is running from machines, I doubt he would worry about buttoning up his jacket.
Continuity mistake: When Kate gets the phone call in the middle of the night to goto the pet clinic, her phone is a white+blue Nokia 8310. Later on when she is calling from the back of the pet truck and it loses reception and the camera goes onto the phones, its now an all blue Nokia 51xx (I think) series phone.
Continuity mistake: As the hearse comes out from under the truck while they are trying to get rid of the Terminatrix, you can see that the windscreen is intact. But as they drive down the hill it's missing.
Continuity mistake: After the first two fireman jump out of the fire truck, Arnold climbs in and says "Get out" to the other fire fighters. When the next two fireman jump out, the first two are not seen on the road behind them. Also, when Arnold changes gears on the fire truck none of the four fire fighters are seen on the road.
Continuity mistake: In the scene were John, Kate and the Terminator find the RV, when John says to Kate, that Scott's death wasn't her fault, she is sitting in the passenger seat of the broken down Hearse. Then in the next shot Kate completely disappears and reappears when the Terminator mentions the TX is going to kill Robert Brewster.
Continuity mistake: When John and Kate are in the bunker and they are talking about why they are there, we see John look down at the timer. It reads one minute 16 seconds. When Montana Civil Defense is talking over the radio, he deactivates it at 7 seconds. It should have read 27 seconds; there had been no breaks in the scene.
Continuity mistake: When the Terminator and John are talking while driving the pet truck through the desert with Kate in the back, keep watching out the Terminator's side. In the distance, you can see about three huge cone-shaped trees and every time the Terminator talks, they're always in the shot. In one shot, there's about five, then it's always three again.
Continuity mistake: In the scene at the gas station, Arnie removes the iron bar from the truck's doors and discards it. The truck drives off and is seen to have no bar holding the doors closed. There then follows a lengthy conversation between John and Kate. At the end of this conversation the truck is seen driving down a slight hill just before the scene changes to Scott's apartment- look closely and you'll see the iron bar on the doors, despite Arnie having removed it.