The 1982 science fiction classic “Blade Runner” was set in November 2019 in Los Angeles. But the LA envisioned by director Ridley Scott is very different from the LA you’d recognize today. For one thing, it’s raining all the time, and it’s a dystopian hellscape with flying cars, pervasive technology and artificial humans, or replicants, who are almost indistinguishable from real humans. Also, almost everyone smokes. Aside from the obvious, how far off is the movie from present-day 2019?