Continuity mistake: When escaping out of the parking lot, John drives past the same blue pick-up truck twice.
Continuity mistake: John Connor comes out of the parking lot and appears right in the middle of the truck's lane, making the driver swerve to his left. From a close-up, the driver turns the wheel and straightens the truck and keeps on driving, but the following wide angle shows the truck swerved and the driver straightening it again.
Revealing mistake: Sarah Conner spins up the drill to remove The Terminator's access port and Arnold flinches as the drill is close to his eyes. A 'real' machine wouldn't flinch. (01:11:40)
Other mistake: In the Director's Cut, there is a scene where they "reset the switch." The Terminator tells Sarah and John to "rotate the locking cylinders counterclockwise." But the power tool is rotating clockwise.
Visible crew/equipment: As the Terminator gets on the bike at the start, the barman comes out and fires a shotgun. Look in the bike's mirrors to see some film crew moving around. (00:09:30)
Other mistake: During the bar scene when the T-800 is on the motorcycle and the bar owner comes out and fires the gun, Arnold Schwarzenegger flinches, specifically his eyes close. (00:09:30)
Continuity mistake: The amount of ash on Sarah's cigarette during her review changes instantly. (00:23:20)
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: When the Terminator shoots the T-1000's head apart, in the shot of the T-1000 after the elevator door closes, Dr Silberman can be seen standing against a wall in the background. Then it cuts to the main trio in the elevator, but when it cuts back to the T-1000 and his head merges back together, Dr Silberman has suddenly disappeared. (01:02:40)
Continuity mistake: During the truck scene, when the truck has just come off the bridge, notice the sign on the right hand side says "24 hours." Seconds later the sign seems to have mysteriously disappeared.
Other mistake: Near the end, after they enter Cyberdyne, the other guard notices the main guard gone. He goes to the bathroom to find him. "Gibbons, you can't leave the desk like that." The interior door is slightly closing when he opens the main door. How is this possible?
Suggested correction: That's explainable by air pressure from opening the outer door causing the inner door to move. They don't have handles and only have to be pushed open so they can be moved by air pressure.
Revealing mistake: In the scene where the Terminator has just broken Sarah out of the hospital and the T-1000 has been shot off the back of the cop car you can see his "metal" arms bending as he rolls across the pavement, and as he gets back to his feet you can see where his real hands are.
Continuity mistake: When Sarah Connor throws the keys to a male orderly to distract him, Dr. Silberman is standing right behind him. Two shots later, we see the doctor several feet away. The time lapse between the two shots was only one or two seconds. (00:56:25)
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.
Revealing mistake: When the cop by the vending machine is about to be killed by the T-1000, the back shot of him reveals he's been replaced by an obvious mannequin. His perfectly trimmed hair along the nape is now long and messy, and a long stitch appears along his sideburn and down to the neck.
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.
Audio problem: When Myles is shot at in his home, after he ducks, the window behind him breaks and smoke comes outs as if a bullet had gone through, but no sound is heard. (01:32:50)
Audio problem: When Terminator lifts John off his bike and places him on the chopper, John's cry is heard but his mouth isn't moving.
