Not only is the building used for exterior shots of the hospital the same building used in the 1980s series "St. Elsewhere", but the hospital's PA system can be heard in the background calling the names of characters from "St. Elsewhere": "Doctor Axelrod, report for rounds"; "Doctor Westphal, you're wanted in ICU"; "Doctor Fiscus, go to ER". Tom Fontana, who is one of the producers of "City on a Hill", was a producer and writer on "St. Elsewhere".
Kevin Bacon is married to the director of this episode, Kyra Sedgwick.
Jackie Rohr visits Bennie (Benedetta) at the hospital. The exterior shot of the hospital: appears to be the same building used as exterior shot for St Elsewhere hospital--Franklin Square House in Newton MA.
Rohr asks Bennie if "Dr. Morrison" talked to her about drug counseling. Jack Morrison was David Morse's character on St. Elsewhere. That building that was St. Eligius is in the South End on E. Newton St, not in Newton. They also page Dr. Jackie Wade, another character.