Plot hole: The past has changed, but Kyle Reese is evidently the same one who was sent to protect Sarah Connor. In "T1", he explains to her that the T-800 CSM-101s are new units, with real human tissue, difficult to recognize, and that he had to wait for the cyborg to approach her before he could identify it; this means that he had never seen a T-800 that looked like Arnie. In this film, however, as soon as he sees the T-800 "Pops", he shoots it and later claims to have never seen an "old" Terminator. (00:28:31 - 00:31:36)
Continuity mistake: After the truck crashes into the fire hydrant, Kyle picks up the gun and searches the back to shoot Pops. He appears around the back and aims the gun, with the gun raised to his chin. The shot then cuts to a closer shot of Kyle, with the gun now suddenly lowered to his chest. (00:28:50)
Continuity mistake: In the bus scene on the Golden Gate bridge, right after the bus flips end-over-end, we see it sliding broadside from Pops' point of view through the hole in the police car windshield, at most a few hundred feet ahead. At this point, the bus falls over the side of the bridge, breaks apart, then catches and hangs there. In the ensuing wide angle shot, even though Pops was a mere block away and racing at top speed, his car is nowhere in sight. What's taking him so long? Did he take the scenic route? Perhaps stop for beverages? Meanwhile, as Kyle and Sara snap out of it, exchange some dialogue, and begin scrambling upward to safety with John Connor again in hot pursuit, a full minute passes before Pops finally rolls in to save the day. (01:28:35 - 01:29:15)
Factual error: During the opening narration Kyle Reese states that Skynet attacks humanity on August 12, 1997. In the shot of missiles decimating San Francisco, multiple 2005-present Toyota Priuses, Dodge Chargers and other late model cars are seen.
Continuity mistake: When the T-1000 walks past the deactivated T-800 just after being shot at by Kyle Reese, you can see that the T-800 has taken a lot of damage to the face and the nose is missing. Once the T-800 gets up after being reactivated you can see that the nose is back with a lot less damage to the face with a close up shot.
Continuity mistake: When Pops, Kyle and Sarah are in the helicopter, Sarah's hair flips between loose and tied up in a ponytail.
Factual error: Kyle and the others humans should be malnourished because of the lack of food in 2029, but no-one seems anything like that, even Kyle is in great shape.
Factual error: Both Kyle and Sarah show no signs of injury after they have been hit by the car in 2017 when they appear on the freeway, despite being thrown from the bonnet and landing naked in the road.
Visible crew/equipment: When Miles Dyson, president of Cyberdyne, is talking to Danny Dyson and John Connor; whilst they are all looking towards the production line of liquid metal, you can see that the bodypack transmitter falls/dangles off under Miles Dyson's suit jacket. And as he steps off the shot, you can see him reach under with his hand to attempt to hide it.
Continuity mistake: After Pops puts the deactivated T-101 in the truck, the mouth is closed in typical grim determination type look. A few minutes later, the expression has changed somewhat and the mouth is slightly agape. Later, in the factory, the 101 is laid on the floor, and the face is in the original position of determination.
Continuity mistake: Towards the end while Kyle is talking with his younger self, the sun changes between shots.
Factual error: When Sarah Connor plays the boom box, the cassette tape is all the way to the right spool, which means it's at the end and must be rewound to play.
Continuity mistake: John has the scars on his face from Terminator Salvation events indicating that it's the same and original timeline, and also Skynet was going to send the T-800 to 1984, but the original T-800 is sent once again in Genisys.
Suggested correction: Terminator Salvation and Terminator Genisys are not in the same continuity. The scars on John Connor's face have been a recurring feature since he was shown in Terminator 2 (played by Michael Edwards). Both Salvation and Genisys were referencing this original design of the character.
Continuity mistake: When the T-1000 is coming after Kyle, Sarah and Pops in the van, they shoot at his police car. In one angle the bullets break through the glass. In the next shot from the T-1000's view, the bullet holes are gone. They then return.
Continuity mistake: When Kyle is introduced to Pops in the truck, the scenery outside doesn't match the street when the T-1000 picks up its small piece.
Continuity mistake: The wounds on Kyle's and John's foreheads disappears before they send Kyle to 1984.
Suggested correction: That 1997 was from another timeline before the events in Terminator 2 altered history. It's possible those models may have existed earlier in that timeline than in our world.
This is assuming too much about the alternate timelines. There would have to be more concrete evidence that such things would be altered in said timelines. Also, considering that timeline is supposed to be what took place from Terminator 1 in its own separate timeline, we would go still by our own following the events of it leading up.
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