The character of Dr. Camille Saroyan was originally only supposed to be on 6 shows and was going to die, but they liked her character and decided to keep her on the show.
The prison scenes were shot at Old Joliet Prison, aka Joliet Correctional Center (originally known as Illinois State Penitentiary, colloquially as Joliet Prison, and Joliet Penitentiary) in Joliet, Illinois. The prison was closed in 2002. In 2018 it was opened for tours.