Nice story, but as somebody who lived in 1982 in the USSR, I should note that there was no first class on flights between Moscow and Leningrad (St.Petersburg), incoming and outgoing international calls did not work in automatic mode - all calls were switched through operator, only Beriozka stores accepted foreign currency, GUM was local currency only.
Yeah, I was somewhat surprised by those. "Classes" on domestic flights in the USSR?! And yeah, GUM was (and still is) a department store for Soviet citizens - https://en.wikipedia.org/wiki/GUM_(department_store).
No, long-distance trains had four classes: SV (two beds per cabin), Coupe (four beds per cabin), Platzkart (six beds per cabin) and Sitting (no beds, just benches). This classification goes back to Tzar (pre-revolution) times.
It has nothing to do with air transportation which has been developed in Soviet era, where everebody was equal.
There never had been kvas from wooden barrels in Moscow in 1982 or after. Kvas was sold from metal trailer tanks like this one: http://mtdata.ru/u22/photo30E5/20831353979-0/original.jpg till 90s and then it was gone (I left in early 2000s though I doubt wooden barrels with a cup on a chain appeared later).
Stuffed potato is not something Russians eat, least something so popular to be sold on the street. So, again, it was not sold in 1982 or later.
Blinchiki is something that could have been possibly sold since Russians do eat them. I've never seen them sold on the street myself but I cannot possibly say it's as ridiculous as stuffed potato.
