While this is technically Jeff Conaway's last episode, it's also the return of his character Bobby after leaving the series at the end of Season 3. He only appears in a few Season 4 episodes because they were held over from the previous season.
Bobby's speech regarding "Titan's burning wheels" comes from Act 2, Scene 3 of William Shakespeare's "Romeo and Juliet."
When they say their goodbyes, Elaine says they'll be seeing Bobby on television sooner than he thinks. It would be just over a year when Jeff Conaway appeared in the series Wizards and Warriors.