We still have lawyers.
Doc Brown would have gone to a regular plastic surgeon instead of a Rejuvenation clinic.
No one wears two ties at once.
Before going into Cafe 80’s Doc would have handed Marty a $5 instead of a $50 for a soda.
Marty McFly will look different in the future.
Marty had a hard life and didn’t take care of himself, whereas Michael is wealthy, enjoys his life, and has had the very best of medical care. So there 
Fashion: In the 80’s it looked like fashion in the future was just going to get crazier and crazier. Luckily we had the Grunge of the 90’s to bring us back into reality. Most kids just wear jeans and t-shirts now, not weird stuff.
Marty would be wearing a short sleeve shirt over a long sleeve shirt.
A lot of bars/clubs do have “Eighties Nights” though, I wonder what an authentic '80s transplant would think of that?
He would probably have gotten Botox. That would probably seem pretty weird to an '80s teen. “You look really young, Doc…but oddly expressionless.” “Oh, I had a powerful neurotoxin injected into my face! Everyone’s doing it these days!”
one of the thugs could wear one of those Under Armour synthetic material shirts. Not quite the cool quick drying clothing in the original movie, but it would still be “future-ish” material.
Actually, having a fax machine in the home is one thing they got right. Although I don’t think we’ll be needing one in our closets in the next 4 years!