Yeah, I was alive waaaaaay back then — I was in high school.
I haven’t noticed any big anachronisms, but there are a few little ones. For example, the mall is way bigger and more complex than they were then. Average kids didn’t have money to go on a shopping montage. Walkie talkies wouldn’t have had anywhere near the range theirs had — if you were biking all over town, you’d mostly get static. Billy wouldn’t have had that mustache, definitely not.
The house decor is great, and the costumes are perfect — that dress El wore to the school dance at the end of the first season? I swear I had that dress. And the lack of communication is right — if somebody didn’t show up where they were supposed to be, you’d have no way of knowing what happened. All you could do was call their home phone, and it would just ring and ring if they weren’t there.