Two more things:
1) Decades ago a European friend came over to visit.
She picked up my 2nd car, a '76 Nova -upon seeing which she said, "Oh my God, it's huge", and drove cross New England to go The Bull & Finch aka the Cheers bar in Boston. She loved it. She also said, "New Hampshire was closed".
2) In the very opening second of the show you see a Ford Grenada (US) speed by. It was a '75-'76 which I think was added as a subtle dating stamp.
Anybody ever notice that?