Adam Busch (Chase One) and creator/director Danny Strong appeared together as Warren Meers and Jonathan Levinson, respectively, two members of the "Trio" in the TV series "Buffy the Vampire Slayer" (1997).
The title of this episode comes from Act 5, Scene 1 of William Shakespeare's "Hamlet" ("Alas, poor Yorick! I knew him, Horatio."), said by Hamlet himself while grieving over the skull of Yorick, a court jester whom he had known as a child.