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.
Continuity mistake: When the T-1000 is driving the truck, he drives off a bridge and the windshield pops off, but in the next scene the windshield is back.
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: If you watch carefully when the T-1000 has driven off the bridge in the truck, you can see the suspension and steering gear collapse and shift (severely) to the driver's right. A moment later, the alignment is perfect.
Revealing mistake: When the Terminator is trying to save John from the T-1000 in the truck, he makes the jump. If you look at his face and hair while he's airborne, you can see it's a stunt double. The Terminator stunt double is also obvious in other shots throughout the film.
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 T-1000 drives his bike throught the glass of the Cyberdyne Systems building to get onto the helicopter, the windshield falls off. When you see it drop to the ground, it's still attached to the bike.
Continuity mistake: In the scene where the T-800 and the T-1000 have their first shootout in the mall, John Connor begins to run down a series of stairs to get to his dirtbike. Every time he passes a door it reads the level he's currently on. You will see he passes level 2 twice.
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!]
Continuity mistake: After The Terminator exits the bar in the beginning and takes the gun from the bar owner while advancing towards the owner he takes his left hand off the barrel. From behind though, he's still gripping it.
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.
Visible crew/equipment: In the scene where the Terminator is stood at the broken window of the Cyberdyne building, just after he has shot the police cars with the Gatling gun, he uses a grenade launcher to fire a grenade through the side window of a police car below. Look carefully and you will see a rectangular package, presumably a small charge fitted by the special effects team, on this side window exactly where the window smashes to simulate the grenade smashing the glass a split second before exploding inside the car.
Continuity mistake: When the Terminator saves John on his bike in the alleyway and the truck explodes in a ball of flames, the Terminator takes his shotgun out and cocks it to aim at an approaching object. After realising it is a flaming tire, he leaves. However, after stopping to relate his mission to John, the Terminator ejects the fully loaded cartridge (which sounds suspiciously hollow when it hits the ground) and reloads again.
Factual error: There is absolutely no way the Police would send a helicopter to a crime scene with only the pilot on board. He has to fly the helicopter close to buildings, trees, power lines, and he may come under fire or have to manoeuvre out of any one of a number of crisis situations, and fast. He cannot possibly serve as an observer or pass on situation reports as well as controlling his aircraft. The fact that they needed an empty seat for the T-1000 is no excuse; he would have an observer on board with him.
Audio problem: John Connors bike is an XR-100, it is a 4 stroke engine. In the movie they dub in the sound of a 2 stroke. It is a quiet little engine so that is why they probably dubbed in the sound.
Factual error: In the final act, when the T1000 falls into the molten steel, he sinks and thrashes around rather like a human in water. However, molten steel has a density of around 8 g/cc - about 10 times that of a human, which means T-1000 must weigh about 1600 lb / 700 kg, and is therefore too heavy to do many things we've seen: ride a Kawasaki KZ1000P (up a flight of stairs) without collapsing the frame and blowing out the tires; be dragged by hooks in the lid of a car trunk without peeling the lid like a can opener or ripping off the trunk lid; jump onto the back of a car without collapsing its suspension; operate a helicopter in level flight from either pilot's seat. If he's light enough to do those things he'd basically sit on the surface of the molten steel and fry. Either way there's a mistake somewhere...
Continuity mistake: In the Steel Mill scene, Sara has 8 shells. She shoots the T-1000 once (7 left), then she drops an unused shell (6 left), then reloads (5 left in theory, but there are now 6 on top of the gun). Later she loads the shotgun with the other 5 shells (one's disappeared, but it's back to what there should be) and recocks the gun, ejecting the other good shell. Later, she nearly kills the T-1000 by shooting him with 7 shells.
Continuity mistake: When the T-1000 is entering Dyson's house, he hears on the police radio that Sarah Connor is at "2144 Kramer." Later, just as the police show up at Cyberdyne's offices, the voice over the radio gives the address as "2111 Kramer."
Revealing mistake: When the Terminator is in the elevator and the T-1000 forces the door open, the Terminator shoots the T-1000 in the head. If you look closely you can see that the T-1000's head is already split down the middle.
Revealing mistake: After the T-1000 steals the truck and throws the driver out there is a big action sequence where the truck hits a lot of cars. In one scene the truck hits 2 cars which were both already stopped across the road front bumper to front bumper, blocking the road in the process, making it impossible for the truck to miss them.