So the film references the lead character's unusual taste in 20th century clothing, but not the fact that every single other character we meet afterwards is dressed in the same way. Why did the … Well, vehicles are a pretty good indicator of economic circumstances, and in Looper everyone who isn't a murderous gangster seems to be driving around in vehicles made purely from rust and broken dreams. … Wouldn't that be cheaper than converting your car to solar power? …

See the article here:
5 WEIRD THINGS ABOUT THE LOOPER FUTURE | Scifi Methods