Though I'd have thought he'd have known the difference - and it would have been just as easy to write "My battered concertina" as " My battered old accordion".
For anyone singing it, maybe "The brother on the levee" would work a bit better than "The black man on the levee", meaning the same And "the lousy Esquimau" might perhaps become "the rowdy Esquimau", since it's clearly a noisy party taking place.