Continuity mistake: When the T1000 is chasing John, Sarah and the T800 out of the hospital, the license plate on the cop car changes several times: from 999273 when we first see it to 999232 when it actually stops, then to 999001 after it jumps the grass verge, then from 999013 when it starts going straight, to 999018 when the T-1000 latches onto it.
Revealing mistake: When the Terminator's arm is caught in the wheel and he rips his own arm off and stands up, if you look closely (slow motion can help, but isn't essential) you can see his real arm stretched behind his back under his leather jacket.
Continuity mistake: The scene where John and his buddy hack into the ATM and get cash, John is telling his friend his mother is a psycho. Watch closely as John puts on his backpack twice.
Visible crew/equipment: In the scene where John, Sarah, and The Terminator are in the Cyberdyne building. They have just come down in the lift into the lobby where the SWAT team are waiting and firing gas cylinders. Arnie says his "I'll Be Back" and walks out of the lift. The SWAT team issue various instructions, then say "Ok - drop him!". Now - look carefully. The second they start to fire, look at the SWAT member who is furthest to the left and standing up. If you look right by his shoulder as soon as they start firing, what looks like a crew member walks into the scene, with his hands in his pockets!
Continuity mistake: In the scene where Sarah Connor shoots Dyson in his house, it pans back and forth from him to her. In each shot of Dyson in his living room, the magazines on the coffee table are scattered, then stacked, then scattered again. Also, if you look at the blood on his shoulder, it is very heavy in one shot and very scarce in the next.
Continuity mistake: When the Terminator is riding the Harley chasing Young John Conner, John is down in the reservoir and the Terminator is up on the ledge, as he approaches the end of the wall, through the Terminator's point of view on the bike you see the wall end, it clearly extends to a point, on the very next scene as he makes the jump the point has all of a sudden gone from a point to a squared off edge. Obviously the jump would have been a disaster if the edge was pointed.
Continuity mistake: During the bar scene, when the Terminator is stabbed in the chest. If you pause the movie just after the rubber knife, you can clearly see that he gets stabbed right exactly above his right nipple. Later on when he goes in the kitchen to get the biker's keys, the cut with blood dripping appears on his ribcage far below the nipple.
Continuity mistake: In the scene where Sarah has just shot Dyson and she is crying against the wall, John comes up to her and starts hugging her. Every time the scene changes back to the hugging, look at John's watch. The time changes every time.
Continuity mistake: Towards the end of the film, when the T-1000 controlled police helicopter bears down on the SWAT truck, Sarah tries to gun it down and the T-1000 returns fire. Look carefully at the shots of the back of the SWAT truck, and notice that the bullet marks made by the T-1000 on the closed door keep changing between shots.
Revealing mistake: When John Connor and the Terminator are at the payphone calling his step mom, the Terminator punches the phone and puts a massive dent in it and change comes out. If you look at the bottom of the phone before he punches it there is already a dent there. [Pan & Scan version ideally, although you can just see the very top of the dent for a few frames in widescreen]. [ALSO- you can see that the area where Arnie hits the phone is merely plastic, which is unpainted to match the black phone!]
Audio problem: In the scene with John and his friend in the garage when his adopted mom is telling him to clean his room and he is revving his dirtbike, if you look closely, he has the throttle wide open, but the motor winds down.
Continuity mistake: After the T1000 performs the bike jump to the helicopter he tells the pilot to get out. Watch as he jumps out, the door shuts properly, it then cuts back inside where the T1000 proceeds to close the door for a second time.
Revealing mistake: During the scene where the T-1000 is in a truck chasing John Connor on a motorcycle, take a good look at the actual shot of it driving off of the bridge. The street sign is correct, but everything else is backwards! This is because they shot it backwards and flipped the shot during post production. Since the sign was so obvious, it was digitally reversed. However, a good look at the truck's name on the grill will show the shot is backwards.