At the very end of the episode you can see the flag of Prince Edward Island flying from the flagpole outside the Whitesands hotel. However in the time period of the show, the flag should have been be a union jack with the coat of arms of P.E.I. on it. With the flag seen in the show not being introduced until 1964.
The song Gus plays on his fiddle is called "úrchnoc chéin mhic cáinte" which is a Gaelic poem by the 18th century Irish poet Peadar Ó Doirnín.