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(at around 14 mins) Early in the movie it is stated that only things covered in organic skin can travel back in time; yet the T-1000, which is entirely liquid metal, and John Connor, who is made of nanomachines, travel back in time with no problem. Although this is often cited in regards to Terminators like the T-1000, it may not be an actual continuity problem. It may instead indicate that poly- mimetic terminators clone actual living tissue on their bodies, also explaining why they have to go through naked like anyone else.
(at around 1 min) In the Judgement Day sequence, some of the American nuclear missiles are shown flying in relatively short trajectories and landing back on American soil. This contradicts Terminator 2: Judgment Day (1991) where Skynet is said to have launched nuclear missiles at Russia to incite a counterattack.
In both Terminator 2: Judgment Day (1991) and Terminator Genisys, in several instances, our heroes fire grenade launchers at nearby targets on which the grenade impacts and explodes. High explosive grenades arm about 15-30 meters (45-90 feet) from the launcher after being fired. A grenade launched inside a small room would not have traveled far enough to arm and would not explode.
(at around 1h 27 mins) Heavy vehicles, such as school buses use air brake systems. When a loss of pressure is experienced in the system, such as when John destroys the air tanks, the brakes auto-apply. The bus would therefore come to an immediate halt, not continue on with "no brakes" as is seen in the movie.
(at around 34 mins) In the car chase scene between the T-1000 and the protagonists, Kyle fires a 40 mm grenade from an under-barrel grenade launcher at what seems like less than 10 yards. 40 mm shells have a safety fuse which inhibits them from exploding at ranges less than 40 yards to avoid fratricide. This already was explained to James Cameron by his brother (who was a marine) after Terminator 2: Judgment Day (1991).
(at around 3 mins) At the very beginning of the movie, during the introduction, a barcode is being read off of a person's arm. The laser beams go from one end of the barcode to the other, as if it were reading a line of text. That is not how barcodes work. The entire barcode is always read all at once because the thickness of the bars and the spacing between the bars are what provides the information stored in the bar code.
(at around 52 mins) When Sara and Kyle do the time transport and end up naked on the road at night, a van screeches to a halt with its headlights on, and there is a significant amount of water trapped in the driver front corner marker light that is visible from both the side and front. The water visibly sloshes back and forth inside the light with wave action. Usually indicative of a cracked lens or bad gasket.
Incorrectly regarded as goofs
(at around 28 mins) In the first film, The Terminator (1984), Kyle Reese had no idea what the Terminator actually looked like, unable to defend Sarah until the Terminator "Zeroed In" in the Tech Noir nightclub. However in Terminator Genisys, Kyle Reese knew immediately that "Pops" is a Terminator when they meet for the first time in the armored van. However, Sarah already told him they took care of the terminator sent to kill her. So when Kyle sees "Pops", who looks identical to the terminator lying on the floor of the van, he naturally assumes "Pops" is also a terminator.
(at around 1h 50 mins) Near the end of the movie, while "Pops" and Jon fight in the unfinished time machine, Kyle and Sarah are seen using an elevator and entering the safety vault even though it was previously established that Skynet was capable of controlling the whole facility. Why didn't Skynet disable the elevator while Sarah and Kyle were in it? Or deny them access to the safety vault?
(at around 1h 18 mins) Pops sends Sarah and Kyle 33 years into the future. He amasses an arsenal of weapons in preparation for their arrival in 2017. In all that time spent waiting, he never loaded the magazines with bullets. Instead, he and Kyle now have to do this when they're 'on the clock'. Since he knows the exact date they will arrive, he could've loaded the magazines the day they would appear, or a few days prior. This would not affect the springs in the magazines and the weapons would be ready for action, thus saving precious time.
The original film operated under a "Causal Loop", where the time travelers' actions created the situation that caused them to travel back in time. Kyle Reese becomes John Connor's father, and the Terminators remains are used to develop Skynet. This film not only allows time travel to change the past, but gives some characters knowledge of how things originally were and how they have been changed. Skynet, for example, is able to send back more Terminators than they had originally, apparently knowing that previous attempts had failed. Sarah and "Pops" also already know that Reese is John's father, and that he was originally killed fighting the first Terminator shortly after fathering John.
(at around 52 mins) When Kyle and Sarah first arrive in 2017 on the Freeway after coming out of the time displacement, Kyle turns Sarah to protect her from a fast moving car. The car is seen clearly hitting Kyle firmly in the back at a fast speed. A moment later after being hit, he picks Sarah up with no signs of injury to himself. Such an impact even for a man his build, would have left him with serious back injuries from the impact.
(at around 29 mins) Although first produced in 1982 the Barrett M82A1 (50cal) rifle used by Sarah Connor (in 1984) is the improved A1 model, which was not introduced until 1986. Sarah also uses a MP5K-PDW Sub-machine gun in 1984, the PDW (personal defense weapon) variant was not developed until 1991.