Continuity mistake: Ep. "Samson and Delilah" - When the Jeep Cherokee flips, it lands on the driver-side/rear corner of its roof, completely collapsing that corner of the roof. The camera angle changes and instantly the Jeep is landing on both of its driver-side tires, roof intact, and rolls onto its left side. The angle changes again, and the collapsed roof is back as the Jeep slides a bit more before the shot changes again, and the undamaged roof is shown as the Jeep rolls onto its roof and comes to a stop. The camera pans around the rear of the wreck, and there is no roof collapse at either rear corner.
Continuity mistake: Ep. "Samson and Delilah" - As Derek sits at the table, Sarah is digging jelly from a jar with a knife, moving it onto toast that sits on a plate on the table. The shot instantly reverses and the jar is on the table and she's spreading the jelly with the knife on the toast she now holds in her hand.
Continuity mistake: Ep. "Samson and Delilah" - Sarah carries a plate with a sandwich and a tall glass of milk for John. After talking with Cameron for a few moments, she heads to John's room, arriving with the plate and sandwich, but no glass of milk, and with some of his clean clothing.
Continuity mistake: Season 2, episode 21, "Adam Raised a Cain." While in the garage of Ms. Weaver's house, a terminator, out to get Savannah, takes four bullets from Sarah in the back. Later as you see the terminator go after John and Savannah, you can see his back as he is coming up some stairs, and the terminator now has five bullets holes in its back.
Continuity mistake: EP "Goodbye To All That": On the firing range when John Connor fixes the stoppage on the rifle, his shooting glasses are on his head, when he hands the rifle back, the glasses are now over his eyes, and in the next shot they are on his head again. Not enough time has occurred between shots for this to happen.