Boston’s Park Street Station looked a little different back then:
As far as I can tell, this bit hidden away at Government Center is one of the last vestiges of the old system.
More 70s and 80s pictures from the Boston Public Library can be found here.
I think the most glaring anachronisms, to a non-Bostonian, would be the phone booth and lockers. The styles on the people, contrary to the “Disco 70s” stereotype, seem completely unremarkable to the modern eye. I suppose the cars are slightly bulkier and have more of a streamlined style than you’d expect on a modern subway, but not to a degree that would be immediately jarring unless you’re familiar with the current cars in use on the Green Line.
This would be a great time for you to list some of your favourite restaurants in the vicinity of Government Center and the Boston fish pier.