At the beginning of the episode the janitor (played by Neil Flynn) asks JD why he's walking funny and he says he was taking a short cut through the quarry and takes of his sneaker and dumps out gravel. Neil Flynn would later go on to play Mike Heck in The Middle where he's a manager at a quarry.
Brogan Roche, the "question talker" Dr. Lemmon, that Turk deals with in this episode, is also the patient who was strangled by Irv the security guard in season 3 episode 19