Originally the Terminator was going to use a MAC-10 to shoot at the police, but James Cameron decided to revisit the gun used in Predator (1987). The gun used the same custom Y-frame as in Predator with some modifications. The modified M60 fore-grip assembly was removed in its entirety. To replace it a “chainsaw” grip was mounted on the Y-frame and the M16-style carry handle was removed. This style of carry has become the “standard” for hand-held Miniguns in movies and video games. The Y-frame is still attached to the weapon’s mounting lugs, though with no carry handle, the weapon lost its sling attachment point, forcing Arnold to carry all the weight of the weapon in his hands. In order to fire it, the Terminator carries a duffel bag full of ammo and possibly the batteries as well, as there are some shots that show what appear to be cables leading from the gun and into the duffel bag. It is also possible that the duffel bag was simply used to hide the fact that the cables trailed off set to the power supply and gun control unit.

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Robert Patrick undertook a rigorous running regime and practiced breathing only through his nose, in order to appear to be a cyborg that could run at high speeds without showing fatigue. He had trained so hard that he was able to catch up to Edward Furlong on his dirt bike with ease.

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Production took sufficiently long that Edward Furlong‘s growth caused the production team to have to make certain adjustments during the shoot. He is noticeably younger in the desert scene than in other scenes. His voice began to break and had to be pitch adjusted in post-production. He had also grown quite tall over the months that, for one scene shot late in the production schedule, he had to stand in a hole in the ground in order to maintain continuity in height difference with Linda Hamilton.

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Linda Hamilton‘s twin sister, Leslie Hamilton Gearren, was used as a double in scenes involving two “Sarah Connors” (for example, when the T-1000 was imitating her), and in a scene not in the theatrical release (but on the DVD) as a mirror image of Linda.

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The effect of the T-1000 freezing and breaking up was achieved by filming shots of an amputee fitted with prosthetic, and of Robert Patrick with his real limbs buried underneath the set. Clever editing makes the effect appear almost seamless.

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This is the only “Terminator” film to win or be nominated for an Oscar. It won four out of the six it was nominated for.