While shooting this film,
James Cameron often resorted to what he called "guerilla filmmaking" as a way of getting around acquiring permits needed to film certain scenes. This involved the production crew and actors quickly arriving at a specified location, shooting the scene and leaving before the police arrived. As a result, some of the people seen in a few shots are actual everyday citizens completely unaware they're in a movie. This was also used for re shoots with Cameron even calling and waking
Arnold Schwarzenegger once at 3am to meet him at a location already in full costume to quickly re-shoot a scene. Cameron also used this tactic to film the very last scene where Sarah drives off into the desert. Waiting for the heat to rise to the point that ripples could be filmed a highway patrolman appeared. Producer Gale Ann Hurd convinced him they were working on a UCLA film project and he allowed them to finish.