Heather Menzies-Urich, Robert Urich's real-life wife, appeared in this episode as Spenser's physical therapist.
Kip Niven, who plays Dan Mahaffey in this episode, co-starred along with Robert Urich in Magnum Force (1973).
Tony Shalhoub, appearing In one of his earliest roles here as a doctor, would go on himself to play a former-cop-turned-private detective in the TV show Monk (2002) 15 years later.