Continuity mistake: After being visited by Reese, Sarah runs down the corridor. Note the window shadows on the floor: There are two sets of shadows plus a blurry third one. Sarah runs past the second set towards the third, then the shot changes and she has moved back to the first set where she began her run.
Continuity mistake: The Terminator's holding his pump shotgun with both hands, then just his right hand when he keeps advancing on the bartender outside the biker bar.
Continuity mistake: During the final battle, the T800 at one point is trapped but manages to free himself (losing one arm in the process). He comes back to slice the T1000 in half with a metal bar. The T1000 kicks backwards at him (karate-style) - and the metal bar is flying away! Yet in the following shot, it is still there embedded in the T1000.
Suggested correction: It doesn't fly away. It is wrestled out of the T-800's hands as the T-1000 turns around because it's stuck in the T-1000's body.
Like, to the top left of the frame? Possibly. Depends a bit on playback speed too.
Continuity mistake: After the T-800 breaks the window in the mall, a blonde girl in a white and blue shirt is on the left but in the next shot is on the right.
Continuity mistake: When the helicopter smashes into the back of the police van the front gets completely smashed in and crumples. Next shot is from the side - the helicopter falls to the ground and the front is intact, then smashes to pieces on impact.
Continuity mistake: When Sarah uses her shotgun to shoot the T-1000 in the eye, the first camera angle reveals that the shot has disfigured his head forcing the tissue around the eye to be pushed outwards as a result. In the next shot, when we can see Sarah through the hole as it 'heals', we can see that the head is already in its regular shape as the hole fills.
Continuity mistake: As the liquid nitrogen tanker crashes into the SWAT truck, the semi's right headlight is destroyed, but a second later it's back in position, and no damage to the nose of the semi at all.
Continuity mistake: After John gets off the bike, he looks at the Terminator's back and sees the holes in the jacket. John puts his finger in one hole, but when the view changes the finger is in another hole.
Continuity mistake: When John and Sarah are in the pick-up truck trying to outrun the overturned liquid nitrogen tanker, the driver's door of the pick-up truck goes from swinging open, to closed, to open again between shots.
Continuity mistake: At the steel mill, the T-1000 points his finger at Sarah and tells her to call John. The style and position of the loose hairs around her forehead change between frames.
Continuity mistake: When Terminator shoots at the police from the Cyberdine window, from the angles in front he is in the middle of two window frames, yet from the angle shot from behind he is inches away from the left frame.
Continuity mistake: At Pescadero, after Terminator pushes a female guard away, John runs to Sarah and asks if she's okay. Her body is positioned pointing in an 8 o'clock direction first, and in the following shot in an 11 o'clock.
Continuity mistake: At Pescadero, when the female guard breaks Terminator's glasses, from the angle behind the left lens is pointing upwards, yet from the front it's downwards and the damage is greater.
Continuity mistake: When Sarah sees the Terminator coming out of the elevator and crawls backwards panicking, there's a thick line painted on the floor. When the angle changes and shows her standing up and running, the line is gone.
Continuity mistake: When Sarah is about to jam the syringe in the plastic jug, watch its label and notice it turns around between frames.
Continuity mistake: At the hospital, a guard opens a door with his club, takes it away and looks inside. From a different angle the club is still on the door.
Continuity mistake: When Dyson enters the vault, the door is open different amounts between shots.
Continuity mistake: The position of Sarah's left hand clenched on the playground fence is higher-than or parallel-to her right hand, depending on the angle.
Continuity mistake: When the Terminator arrives on earth, his position differs between the first and second shot, with his left leg protruding more/less and his back crouched/slightly raised.
Continuity mistake: At the hospital, when Sarah is dreaming of Kyle and rests her hair on his left shoulder, her hair swaps from messy to brushed between shots.