A few years ago there was a show on MTV called "That '70s House." It was like "Big Brother" -- put a bunch of strangers together in a house and vote one out each week. But this house had the decor and technology of the 1970s, and all the "houseguests" were in their 20s, and they weren't allowed to have any modern stuff (e.g. cell phones and mp3 players).
There was a phone. I think it was actually Touch-Tone (as push-button phones were called then), not rotary, but the young 'uns still couldn't use it. Why? All their contact numbers were stored in their cell phones!
When I was 10 we moved into a house that had cable TV already hooked up, and it was fairly cheap, so we kept it. This was 1969, so there were no dedicated cable channels; cable was a way to get nice sharp reception without having to fuss with antennas, especially if you lived a distance from the station(s). I was thrilled because it also brought in UHF channels without the need for a UHF tuner. I was in heaven watching reruns of Kimba and Gilligan's Island and such on Channel 56.
I remember the lunch counters at Kresge's and Woolworth's (both of which my mom called "the 5 and 10"). Kresge's lives on as Kmart, Woolworth's spawned a mall version called Woolco, but I think that's long gone.
12-cent comic books! I had a huge collection, some with covers, some without. Periodically my folks would make me weed out the stock and sell off any I could bear to part with, as long as they had covers. I doubt they'd be worth much today -- I was into Richie Rich and Casper and such, and they just never took off as collectors' items the way the superhero comics did.
I remember when "long distance" calling was a big deal. Ditto "air mail." We had to use special ultra-light stationery for the latter -- did they think regular-weight paper would keep the plane from taking off? I think air mail stamps cost more, too.