This is Daniel Radcliffe's third time guest starring, but his first time playing himself.
Chalkboard gag: "April Showers did not date the President". A nod to the Trump/Stormy Daniels dispute.
The title is a reference to the phrase "no good deed goes unpunished".
The laundry line-walker in the silent film clip is probably a reference to Harold Lloyd, who was famous for similar stunts.