In light of the oreos thread, I was going back through my memory to the days of yore. I'm 36 so probably too young to initiate such a thread but I do remember the following:
"Regular" Gasoline (aka: Leaded Gasoline): Now we have 87, 89, 91 or 93. Back in the 80s you still had "Regular" (always in a red pump: danger!!!) and Unleaded (in a black pump). Leaded gasoline is a sick joke. It's like running an internal combustion engine on tobacco.
Afternoon Newspapers: With updated news from the morning, I guess? Needless to say, newspapers were a much bigger deal in the pre-internet days. Also, the reporting and stories were vastly superior to what we have now (I'm just referring to the individual newspaper quality; it's obviously much easier to get news now, on the whole, though I still think local stories at least were better-reported back then).
Betamax / Atari / Laserdisc: Betamax was definitely on the way out, but I remember seeing beta tapes in a tiny section of the video store probably when I was 4 or 5 (video store will probably be another old-timey thing soon). Atari was pre-nintendo, with some of the worst games ever contrived by man. Laserdisc doesn't really belong here - 90's tech, too recent. It was like the DVD version of Betamax, with a CD looking thing the size of a dinner plate that you had to change maybe every 30 minutes.
Wandering All Over The Place, Unwatched By Parents: I, and everyone else in the neighborhood, would go all over the place, into ditches and forest trails and whatnot. Not too far away but often a good mile of two from home. We would, of course, provide parents with a general idea of where we were ("going to so-and-so's house") but honestly we had pretty free reign to go anywhere we wanted, and I was no more than 6 or 7 at the time. Also, no helmets when riding our one-speed BMXs. Anyone wearing a helmet at the time would have gone home devastated. I don't think this is nearly as true now.