
Continuity mistake: The T-1000 punches his body through the window of a helicopter to get inside. An instant later, the hole in the windshield is gone. (01:56:35)

Directed by: James Cameron
Starring: Arnold Schwarzenegger, Robert Patrick, Xander Berkeley, Edward Furlong, Linda Hamilton

Continuity mistake: The T-1000 punches his body through the window of a helicopter to get inside. An instant later, the hole in the windshield is gone. (01:56:35)
Factual error: The truck that the T-1000 uses to try and run down John in the overspill, is a Freightliner FLA 9664, which uses a diesel engine - it does not use petrol. Diesel is much harder to combust in comparison to petrol/gasoline, and the spark from the battery cables on the spilt diesel would absolutely never ignite under those circumstances. (00:37:55)

Revealing mistake: In the scene where the Terminator and the T-1000 are fighting in the corridors of The Galleria, the Terminator has fired multiple shots at the T-1000. When he gets up off the floor, the Terminator throws him into the left wall and the impact hole is already visible before he hits. (00:31:45)
Trivia: The minigun that the Terminator (Arnie) uses in the Cyberdyne scene was so heavy that Arnold Schwarzenegger was the only person on set strong enough to lift it.
Suggested correction: In one of the special features on the Blu-ray version, director James Cameron can be seen holding and shooting the minigun, while saying: "Arnold's gonna love this."
Trivia: The insert car driver (towing the bike ridden by Eddie Furlong) was warned at the very beginning of the scene where John rides out of the mall and the T-1000 is chasing him, that Robert Patrick could run exceptionally well. The driver confidently said that Patrick wouldn't catch him. However, on the very first take, Patrick ran right up and tapped Furlong on the shoulder. So if this was real life, the human race would be in trouble.
John Connor: We've got company.
Miles Dyson: Police?
Sarah Connor: How many?
John Connor: Uh, all of them, I think.
Dr. Silberman: You broke my arm!
Sarah Connor: There's 215 bones in the human body. That's one.
The Terminator: I need your clothes, boots and your motorcycle.
Cigar Biker: You forgot to say please.
Question: One of the taglines for this film is "It's nothing personal". I have no idea what that has to do with the film and was hoping someone could explain it.
Chosen answer: Two possibilities. 1: The Terminator is emotionless, so the killing isn't personal, but rather what it's programmed to do. 2: Sarah Connor's plan to kill Miles Dyson to stop Skynet's creation.
It's also a sly nod to another famous tagline, Jaws: The Revenge. "This time it's personal."
Question: Does anyone know what game John Connor was playing in the arcade when the T-1000 found him?
Chosen answer: He's initially playing Missile Command, then he goes to play After Burner.
Question: Arnold said that when the T-1000 took the form of someone he would likely terminate the person being copied. Why didn't the T-1000 kill Sarah? He had been in physical contact and could mimic her voice. There was no reason to get her to call John at the end, he could have killed her immediately.
Answer: In addition, another deleted scene shows that the T-1000 was damaged by being frozen and thawed and was having difficulty maintaining form. He wanted to be sure he wouldn't mess it up.
What's especially odd about the scene is that both examples we gave to help answer this question were actually deleted from the original release. When I first saw this movie in the theater when it was released I had the exact same question, it wasn't until I saw the Special Edition with the deleted scenes reinserted that it made sense.
Answer: It comes down to the difficulty in impersonating someone John actually knows. The T-1000 had failed impersonating someone close to John when he got the name of the dog incorrect. A deleted scene (re-incorporated into the film in the Director's Cut) shows him checking the dog's tag afterwards, so he is aware exactly how he was outsmarted. Keeping Sarah alive is a way to avoid this sort of mistake. She is more useful to him at this point alive. He is not expecting her to endure his torture and he certainly isn't expecting her to be able to fight him afterwards.