Given that he's spent a not insignificant amount of familiarizing himself with the works of Shakespeare, he can't really blame Sam for having retained the particular details of this bit of trivia. Or any trivia, to be perfectly honest. It might not be anything that he would have expected, perhaps, but there's hardly any harm in it either - and he can't deny that it is interesting besides. Especially given that he hasn't spent a lot of time looking into the finer details of that particular era of music.

"I'm not surprised. Especially if the ending it was undoing was a more bittersweet one."

To say nothing of the fact that he can't imagine that a song someone wrote simply to appease the people who wanted to have the ending of the previous song undone would have had quite the same emotional depth as the first, even if all the people involved in the song's creation had put in as much effort as they could without it seeming over the top.