Ooh, this sounds like fun! 
The whole overcommercialized, overhyped, overproduced, overpriced, decadent, bloated Christmas season will face a massive pushback. It’s going to start later and end much quicker, it’s going to be much lower-key, and no one’s going to be expected to be a part of it. A plethora of songs, including Baby It’s Cold Outside, Grandma Got Run Over By a Reindeer, and anything involving religion, will not be played at all anymore.
The Baby Boomers will maintain an iron grip on most aspects of American society well into the aughts…then, in a remarkably short timeframe, be almost universally seen as self-absorbed, useless, greedy ingrates and lose pretty much all their influence.
Massive national chain stores will spread across the country like wildfire, ruthlessly crush all opposition…then, one by one, quietly disappear for reasons that don’t make much sense.
Everything about video games is going to completely, royally suck. Don’t have time to explain it all, but in a nutshell: Grossly overpriced random items, grossly overpriced non-random items, all-electronic formats which can be yanked or butchered at any time, games released broken and unplayable, work conditions worse than on the Death Star, executives ranging from “totally evil” to “extremely evil”, vital functions like reporting offensive behavior handled by automated systems that never work, creativity getting stomped flat, some companies saying the hell with it and giving up producing games entirely, aaaaaand occasionally a completely innocent woman gets her life ruined for no good reason.
Treating women like sex toys in the office will be made illegal, and numerous men will face serious repercussions because of it. These measures will be widely accepted and never be seriously challenged.
After Alison Bechdel completes a landmark 527-episode lesbian comic strip series with an amazingly rich, diverse cast of colorful characters, as well as numerous side projects and three critically-acclaimed books, making her the single most successful lesbian cartoonist in history, the one thing she will forever be remembered for is some stupid throwaway strip about action movies. Numerous Hollywood writers and reports will proclaim this to be her TEST and very loudly cite this TEST as an ironclad indicator of a movie’s quality.
Mike Tyson will annihilate all comers en route to unifying the heavyweight championship. He will then have one shocking defeat, one fairly unpleasant scandal, and one embarrassing in-ring mental breakdown, and then he’ll go on a slow, boring decline and fade away with zero fanfare.