When the gas truck is about to be blown up with the pipe bomb, you can see a cable towing the truck in the last few frames.
At the end of the movie when "The Terminator" pulls himself from the rubble after beng hit by a lorry you can clearly see a silhouette in the background pulling a lever which operates the robotic version of Arnie.
Contributed by: Edward Fong
In the famous scene where Arnold says "I'll be back", his sunglasses, purposefully worn by the Terminator to hide the fact that he had surgically removed his prosthetic eyeball, are not tinted sufficiently to hide the fact that it's just a movie and that this Terminator does indeed have both of his eyeballs still.
Towards the end of the movie, when the terminator breaks through the door leading into the factory, you can see a man kneeling down, controlling the exoskeleton.
Contributed by: Mark McGinley
When the Terminator crashes the car into the police station the cop notices the lights from the car approching but when they show the car about to crash into the doors the car lights are not on.
Contributed by: Anonymous
When the Terminator crashes into the wall during the first chase, the cop finds his car empty. This is a goof because the Terminator, as we know him, would not have left without ensuring Sarah was dead, no matter how damaged he was or who else was on the scene.
When The Terminator kills off the first Sarah Connor, the news bulletin says she is survived by her two children... The Terminator was suppose to stop Sarah Connor's son becoming the leader of the rebellion... seeing that she already had two children, why did The Terminator also not kill them off??... Remember The Terminator did not know who the right Sarah Connor was.