Continuity mistake: During the chase in the beginning, Arnie shoots out the left front tire of the truck causing it to come mostly off the rim; yet when it runs into the divide and explodes, the tire is completely inflated again. (00:37:45)
Continuity mistake: In the scene where the Terminator and John are at the pay phone John picks the gun off the floor, it's cocked when it's in his hand, but as soon as he passes it to the Terminator, it's not cocked any more. (00:47:30)
Continuity mistake: When the T-1000 is chasing John in the black tow truck, after the truck goes off the bridge you can see that the truck has two tall exhaust pipes behind the cab. Then right after the truck hits the 2nd old car it shows a shot from behind the truck and the pipes are suddenly cut off. (00:34:55)
Revealing mistake: When the T-1000 is firing out of the hole in the windshield of the chopper, a close up shot shows that there is clear tape around parts of the window keeping all the little bits of glass together. (02:03:15)
Continuity mistake: In the car chase just before the final encounter in the foundry, the T-800 slams on the SWAT van's brakes and the helicopter slams into it, crushing the choppers front. A second later it is in reasonably good shape. (02:04:00)
Continuity mistake: When the SWAT van crashes through Cyberdyne's front doors into the lobby, it comes to rest with the rear doors closed. When Sarah and John Connor enter it, it's in a different position and the rear doors are fully open. (02:00:35)
Other mistake: When the aqueduct chase has finished, and the T-1000 strolls out of the fire, the semi is hardly burning in the background. Considering that the semi has just violently exploded, and the small bridge it just crashed into was nearly flattened, it seems odd that it shouldn't be burning (very tricky to see, best use zoom in). (00:38:40)
Revealing mistake: When the T-800 is being attacked by the SWAT team in the Cyberdyne building, notice that in most of the shots (i.e. when he is being shot in the face, and also when the camera is behind him) Arnie has been replaced by a dummy (his skin is unnaturally pale). When the T-800 pulls out his gun and starts shooting the SWAT team, it's now back to the real Arnie, and notice how none of their bullets are now hitting his face and body, even though shots are still being fired. (02:00:20)
Continuity mistake: During the aqueduct chase the amount of damage to the semi-trailer truck changes repeatedly. Damage to the semi's grille is severe, then is not. This happens about three times. (00:35:20)
Revealing mistake: When the T-800 and T-1000 first begin to fight in the steel mill, the T-800 puts his fist through the T-1000's head causing him to revert to liquid metal form, then as the T-1000 is throwing the T-800 from side to side you can obviously tell that the T-1000 is just an actor wearing a highly metallic mylar suit in some shots. (02:14:10)
Continuity mistake: When Sarah carves "No Fate" into the desk, the tip of the knife curves toward her, then you see it facing away, then when John grabs it from the desk its tip is back toward him. (01:32:45)
Trivia: The movie being about the start of a major worldwide war (with a heavy use of technology too), an interesting coincidence can be seen in the first truck chase sequence. Just as John and the Terminator speed under the bridge that the T-1000 crashes into, a height warning on the bridge can be read which says "CAUTION 9-11". The truck smashes right into it. (00:36:15)
Continuity mistake: When the Terminator drives the police van into the Cyberdyne building to rescue Sarah and John, one of the van's mirrors becomes crushed in on the side. Once the van is onto the freeway the mirror is intact again. (02:00:30)
Revealing mistake: In the scene where John is helping Arnie up after the T-1000 has been exploded and sent to his doom in the fiery pit of molten steel (Arnie is saying "I need a vacation"), you can see how the effects crew haphazardly put on a fake busted mechanical arm underneath Arnie's coat and how it bulges out from his shoulder. You can almost see how they just tied Arnie's arm back behind his back and put a fake arm over him. (02:23:35)
Continuity mistake: When the T-800, Sarah and John are escaping the mental hospital in the elevator the T-1000 stabs through the top and cuts Sarah in the back. Later when are driving away from the hospital in the police car Sarah hugs John. When the camera shows Sarah's back her shirt is torn but the wound itself is gone. (01:03:10 - 01:06:45)
Continuity mistake: When the SWAT van flips over you can see the many bullets holes on top of the Van. However a few frames later the bullet holes change from many to just a few. (02:04:30)
Revealing mistake: Toward the end of the aqueduct chase, the T-800 pulls John off the bike and it is crushed by the semi. The camera jerks upward as John is pulled off, and you see that Robert Patrick has been replaced by a stunt double who looks nothing like him. (00:37:35)
Continuity mistake: When the T-800 arrives between the tractor-trailers, you can see a bumper sticker (i.e. "Vehicle makes wide turns") on the back of the trailer when the sparking begins. When Arnie arrives in the bubble it "melts" out the back corner of the trailer, and the sticker is no longer there. (00:05:50)
Continuity mistake: In the scene where the Terminator is nude in the biker bar, one biker stabs him. The Terminator then grabs the knife with his left hand and twists the biker's arm. Then the Terminator uses his right hand to hold the biker's arm down on the pool table while still holding on to the knife with his left. Immediately in the next shot, the Terminator right arm is in the air with the knife in his right hand and stabs the biker. (00:08:05)
Revealing mistake: When the tanker truck (liquid nitrogen) is sliding along the ground the sparks can be seen not to be coming from directly under the tanker but ejecting from small canisters slightly higher up the vehicle. (02:02:55)
