Rollerball came out in 1975 and was set in 2018. I may be wrong, but I don’t think we’ll ban all war and replace it with an ultraviolent game for our corporate masters. Uh, not in the next five years, anyway.
Terminator 2: Judgment Day came out in 1991, but was set in 1995. Fortunately, things didn’t quite turn out that way.
It hasn’t yet been adapted as a movie (although there’s supposedly a film version in the works), but Philip K. Dick’s 1974 novel Flow My Tears, the Policeman Said is set in 1988. The US is under some sort of military rule, there are adult humans who were genetically engineered, and people regularly travel around in flying cars. Actually, they may have been small personal helicopters, but they were effectively flying cars.
Funnily enough, the technological detail that strained my suspension of disbelief the most was one that was actually pretty accurate: people in the novel still listen to records. And not just hipsters, either. It’s apparently a mainstream way of listening to music and there’s an important scene that involves playing records on a cafe jukebox. In reality 1988 was the first year that compact discs outsold records, so the format was still popular although it was quickly on its way out. But it seemed really off to me that a world with FLYING CARS wasn’t even up to the CD yet.