JJ quotes Nietzsche "If you look long enough into an abyss, the abyss looks into you." Gideon made the same reference in Extreme Aggressor (2005).
When Blake and Rossi are trying to open JJ's safe, Rossi says that Henry's birthday is November 12, which was the air date of the episode when JJ did actually have Henry.
This is one of the very few times when the BAU doesn't present a profile to other law-enforcement officials.
This is the first episode to not feature the opening titles since "Extreme Agressor" (S1E1).
Erin Strauss (Jayne Atkinson) makes an appearance in a flashback scene.