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)

Terminator Genisys (2015)
1 plot hole - chronological order
Directed by: Alan Taylor
Starring: Arnold Schwarzenegger, Jason Clarke, Jai Courtney, Emilia Clarke
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)
Suggested correction: The police car he was driving was badly damaged when he literally fell onto it. It possibly slowed him down a bit.
This is a guess, not a correction. The car seems to work just fine even with the damage.
But when Arnie was exiting it, its left side was also damaged while its left front tyre was destroyed, to the point of causing sparks. It could have slowed him down.
Pops: Old.
Kyle Reese: Not obsolete.
Pops: Not yet.
Trivia: The line "come with me if you wanna live" is said by Sarah Connor for the first time in the franchise.
Question: If John Connor and the resistance are so good at reprogramming Terminators (They have done it 3 times during the series), why don't they just use them to help fight the war? Continuously sending them back in time may have kept Connor alive, but has achieved little else.
Chosen answer: As long as Skynet kept sending other Terminators into the past to kill John Connor before he became the leader of the human resistance, it was necessary to keep sending reprogrammed Terminators into the past as well so that the timeline would not be altered, thus resulting in a Skynet victory. While it is possible that John and the resistance may have used reprogrammed Terminators to help them in the future, this was never depicted or otherwise mentioned within the film series.
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