The Terminator was not a super-high-budget movie. As a result, many MANY scenes on the streets of LA were filmed “guerrilla-style,” where the entire cast and crew needed for a shot would prep ahead of time, arrive at a location in costume/gear, film, and get the f@#k out before police arrived.

So, many of the film’s “extras” were people who had no idea they were in the movie at all.