There are three possible suspects for the assault on Dr. Greene within this episode. Each of them is wearing a dark coat with a hood. There is the brother of the basketball player who died, a psych patient, and the father of the daughter whom Dr. Greene upsets earlier in the episode.
Mary McDonough plays a Lupus patient needing a kidney transplant in this episode. In real life, Mary McDonough suffers from Lupus, blaming silicone breast implants as the source.
One of the subplots in this episode - who is the mysterious author of the salacious novel about the staff in the ER - was never revealed either in this episode or by the series' end.