Interesting Facts on Terminator 2
Robert Patrick trained in a rigorous running regimen while breathing only through his nose, in order to be able to appear to run at high speeds without showing fatigue on film. He had trained so hard that he was able to catch up with Edward Furlong on his dirtbike with great ease, so he had to slow down considerably.
Production took sufficiently long that Edward Furlong visibly aged during the shoot. He is clearly much younger in the scene in the desert, for example, than in other scenes. His voice began to break and had to be pitched one level in post-production. He had also grown so 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.
According to director James Cameron, Linda Hamilton suffered permanent hearing loss in one ear during the elevator shootout because she did not replace her ear plugs after removing them between takes.
Special effects guru Stan Winston and his crew studied hours of nuclear test footage in order to make Sarah Connor's "nuclear nightmare" scene look as realistic as possible. A miniature Los Angeles was made to simulate the scene. Some of the materials used in the miniature that mimicked all the destroyed masonry were Matzos crackers and Shredded Wheat. After each take, it would take on average two days to set the model up to shoot again. In late 1991, members of several US federal nuclear testing labs unofficially declared it "the most accurate depiction of a nuclear blast ever created for a fictional motion picture." The special effects team members have stated several times that no scene they've worked on since has received an equivalent amount of praise or emotional feedback from viewers.