.

I don't know if this counts, but I guess the "Mount Vernon" reference in "Please Leave the Premises" was along those lines. A way to slip in Art's hometown in the guise of discussing historical events - namely, the Washington at Valley Forge reference - Alice: "I'm here, Ralph. Martha was home in a nice warm house in Mount Vernon." Although the Mount Vernon where the Washingtons had lived was most likely not the same town where Mr. Carney had been born. . . .

The 1966 version of "The Honeymooners in England" segment, where the Kramdens and Nortons visited London, I thought, was ironic, given that that was where Sheila MacRae was born . . .

In that context, there may have been a double reference in Alice's comment - not from her end, but from the writers who came up with the exchange. But it's also possible the New York Mount Vernon was named way-back-when after that Virginia town. Ditto for Monticello - (a) the name of Jefferson's house, and (b) the name of a town in the Catskills in upstate New York.