Well, the name of the bar is Prost, which is the German equivalent of Cheers.Dunno if anyone else has been to the bar along the river to the east of Diamond City, but it didn't kick in for me, until I saw the 2 skeletons sitting on two adjacent stools, one with a Postman's hat (which you can take).
I'm sure there were probably some more obscure Cheers references in there, but I didn't see them.
Heh.
And there is a pool room in the back, set up like in the show.