These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Alternate Character Interpretation: Is the narrator of "Cat's in the Cradle" right when he says his son grew up just like him? After all, one of the reasons the son doesn't have time for his father at the end of the song is that one of his own kids is sick, implying that he plans to spend time looking after the kid. So is the son really a Generation Xerox, or does his dad have a case of It's All About Me?
Anvilicious: Harry was never subtle. Listen to "Cat's in the Cradle" and see if you can't figure out the message.
Harsher in Hindsight: The line "There are songs I should have sung", from "Dreams Go By", took on a bit of this after Chapin's untimely death.
At the end of a concert at The Bottom Line nightclub in New York (released on CD), which happened to be his 2,000th concert, Harry calls out to the crowd, "Ahh, two thousand more, huh?" The concert took place in 1981; Harry would die only a few months later.
Memetic Mutation: "Harry? It sucks," a line which originated in the live version of "30,000 Pounds of Bananas" from Greatest Stories Live as Harry's brother Tom Chapin's reaction to the original ending of the song, a lighthearted parody of "Yes, We Have No Bananas." The saying became so popular with Harry Chapin's fans that it was included on concert T-shirts.