Although referenced in this episode as a cathedral, Santiago de Compostela is not a cathedral. It a city located in the northwest of Spain in the Province of A Coruña that has a cathedral. There is a tomb in the cathedral that allegedly contains the remains of one of Jesus Christ's 12 Apostles, specifically St. James, son of Zebedee and brother of the Apostle St. John.
J.J. says that Father Silvano was "invited to say mass at the Washington National Cathedral," which would never happen because the Washington National Cathedral is Episcopalian, not Catholic.
At the very beginning of the episode when Prentiss drives up to the bar, the reflection of the neon "bar" sign on her car is not backward, as a reflection should be.
Morgan: Rossi, don't tell me you believe in evil.
Rossi: Don't tell me you do this job and you don't.
Morgan: I believe there are evil acts, but those are choices, brain chemistry. What do you think, Hotch?
Hotchner: I think deep down inside we are all capable of unspeakable things. Where it starts, or what you call it, I don't know.
Prentiss: (entering the BAU office) Is Hotch still here?
Garcia: Oh, I'm pretty sure he lives here.
Prentiss: Leonardo da Vinci said, "He who does not punish evil, commands it to be done."
Rossi: "There is no heresy or no philosophy which is so abhorrent to the church as a human being." James Joyce
Ian Woolf, first assistant director for the series, guest stars as a cab driver in this episode.
Thomas Gibson and guest star Roxanne Hart worked together previously on Chicago Hope. Guest stars James Remar and Carmen Argenziano worked together previously in the movie Hellraiser: Inferno.
The music heard in this episode was "The Fix" by The Noises 10 and "My Side of the Story" by Hodges during the final scene.
This storyline for this episode was modeled on "Robbie Doe," the Washington, DC, boy on whom The Exorcist movie was based.
Prentiss: 'I think he died for me.'
Prentiss quotes a line from James Joyce's short story, The Dead, published in Dubliners in 1914. This line is spoken by Gretta as she remembers a young boy who was ill and yet ran through the rain to say goodbye to her when she was leaving Galway. Gretta's memory is bittersweet - Michael, the boy, died from his illness within a week. The main character of the story, Gretta's husband, Gabriel, reexamines his life and his own priorities after his wife's nostalgic story.
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