Continuity mistake: At the very beginning of the film when we see the garbage man picking up the steel bin with his forks, if you watch closely you can see the shadow of the large forks pass the windscreen, yet in the following shots the forks are lower than the windscreen. (00:03:50)
Audio problem: When the Terminator first arrives in 1984, the whole time displacement sequence (or whatever you want to call it) is witnessed by a garbage truck driver who mutters 'What the hell?'. His mouth however is obviously saying something else which has been dubbed over. (00:04:00)
Visible crew/equipment: After the Terminator arrives in 1984, he begins to walk over to a short concrete wall and looks at Los Angeles over it. A second before the shot ends, the shadow of a camera is visible to the left of screen. (00:05:05)
Audio problem: Early in the film, when the punks are at the park, one of them is looking through a telescope and the other one breaks an alcohol bottle over it and says "Hey, it's my turn." If we look more closely, he actually says "My fu***ing turn." (00:05:10)
Continuity mistake: Two large railings can be seen curving around the building corners when the cops arrive at the alleyway to pursue Reese. Those railings weren't present in the shot preceding Reese's arrival; the cops pulling up was filmed in a separate alleyway. (00:06:15)
Continuity mistake: At the start of the film when we first see Reese arriving, the drunk homeless guy is holding a bottle in his left hand, then the camera continuously switches between Reese's arrival and the old guy, in these shots, the bottle keeps changing hands from left to right, then back to left. (00:06:40)
Character mistake: When Kyle steals the police officer's gun and asks him what the date is, the officer replies "12th, May, Thursday". The film is set in 1984. May 12th, 1984 was a Saturday. (00:08:25)
Audio problem: When the terminator smashes the car window, the crash sound occurs before his fist actually makes contact. (00:12:35)
Continuity mistake: When the Terminator punches through the car window, there's broken glass all around the window frame. When he closes the door, there's only a little glass around the top of the frame. (00:12:55)
Character mistake: When the Terminator walks into the gun store, the "Clearance" sign in the window is misspelled "Clearnce." (00:13:40)
Revealing mistake: When the Terminator goes into the Alamo Gun Store scene of the famous "Uzi 9 millimeter" quote, the man turns to get something off the shelf, and Arnold takes a shell out of the box on the counter. It is an already fired shell - you can tell by the dimple in the center of the primer. (00:13:50)
Revealing mistake: In the second 'future war' sequence where a female soldier is practically vaporised by a passing HK tank, watch her flaming remains. You can see the (exceptionally fake looking) head of the stand-in dummy tumble away from the body. (00:14:15)
Continuity mistake: When Reese and later the Terminator go through the phone book to locate Sarah Connor, the second Sarah is listed as Sarah Ann Connor. Later, when Traxler and Vukovich are discussing the death of the second Sarah, Traxler reads the name on the police file as Sarah Louise Connor. (00:14:45 - 00:25:30)
Suggested correction: A similar mistake was already corrected. When Vukovich says "girl number 2", he says she was killed earlier this afternoon, not that she was the 2nd victim. Sarah Louise Connor was shot first.
While Sarah is having pizza in a pizza place, the reporter confirms that "2 hours earlier" Sarah Ann Connor was the second victim.
Continuity mistake: Arnold looks up Sarah Connor's address in the telephone book. The telephone book address has 4 digits, but he goes to a house that has 5 digits on it. (00:15:00)
Continuity mistake: When the Terminator arrives at the first Sarah Connor's house, the address number is "14239", even though in the phonebook it is listed as "1823" (or "2816" or "309"). (00:15:15)
Continuity mistake: When the Terminator steps into the house to kill Sarah Connor he walks over the thresh-hold however in the next shot he is outside again. (00:16:15)
Factual error: When Kyle is hot wiring the car he touches 2 wires together and you can hear the starter trying to start the engine. This indicates the wire is controlling the starter. Then he takes the starter wire and twists it onto the other wire, keeping them together. If you really did this the starter would be permanently turned on and grinding on the flywheel. In reality, you would hold the 2 wires together until the engine starts, then disconnect them. (00:16:30)
Revealing mistake: The second future war segment: During the wide shot where Kyle and the female soldier are following the HK Tank, most of the plasma shots fired from said tank seem to come from above the gun turrets and not out of the barrels. (00:18:45)
Revealing mistake: In the second future war sequence. At the end of the HK/car chase, the gunner in the car has been replaced by a very obvious dummy. (00:19:55)
Continuity mistake: Kyle loads a shell into his shotgun, then falls asleep and dreams of his past in the future. When he wakes up, he pumps the shotgun, so the first shell should eject, but doesn't. (00:20:05)