I just came across this interesting throwaway line in this book: "Way down upon the soigné river", which interests me no bounds, because, Hugh Laurie, the most famous portrayal of Bertie Wooster in the TV adaptation of Wodehouse novels has a song that starts like "Way down, upon the Swanee river" (
https://www.youtube.com/watch?v=x-qv8...)
I know the song is older than the book, but it's a nice coincidence.