JJ's son, Henry, is played by A.J. Cook's real-life son, Mekhai Andersen, in this episode.
Jack Hotchner: I worked the case, Daddy, just like you said.
Hotchner: You did a great job, buddy.
Prentiss: It makes sense to stay close to Hotch. He [The Reaper] stuck around Boston to watch Shaunessy deteriorate... not that you...
Hotchner: That's all right. I know he's been watching me. That's part of the reason I stepped down... so he'd think I was falling apart.
Hotchner: Poet Haniel Long said, "So much of what is best in us is bound up in our love of family that it remains the measure of our stability because it measures our sense of loyalty."
Hotchner: "He who fights with monsters might take care, lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." Friedrich Nietzsche
The song heard in this episode was "Evil Is Alive and Well" by Jakob Dylan.
In an early draft of the script for this episode, Hotchner was written to kill George Foyet with his own knife. However, Ed Bernero and Thomas Gibson believed the scene would be more powerful if Thomas used his bare hands.
The Nietzsche quote that discusses fighting with monsters heard in the beginning of this episode was nearly identical to the quote used in the pilot episode, "Extreme Aggressor."
This episode marks the 100-episode milestone for the series.
The writer of this episode, Bo Crese, is actually an anagram using the first initial of each member of the writing staff (Breen + Oanh = Bo and Chris + Rick + Erica + Simon + Ed = Crese) because each writer wrote a section.
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