Prentiss: Why would the unsub use a date rape drug to commit a hate crime?
Reid: (after remembering being drugged by Tobias during his own captivity) Maybe he wants to weaken them, so they can't fight back.

Morgan: I was just thinking---I know how hard it is to grow up without a father.
Prentiss: Their father died a hero.
Morgan: Yeah. So did mine. Doesn't make it any easier.

Reid: (in voiceover) The life of the dead is preserved in the memory of the living. ---Cicero

Morgan: Reid, you all right?
Reid: (barely awake) Hmm?
Morgan: I said, are you all right?
Reid: I'm fine. (looks around) Thanks for broadcasting.

Morgan: Reid, listen to me. What you went through out there, nobody expects you to rebound---
Reid: I can still do my job, all right? I'm not going to freak out.
Morgan: You think I don't know that?
(Reid pauses, considering)
Reid: It was the crime scene photos.
Morgan: Crime scene photos?
Reid: Dead girls in the leaves.
Morgan: (not quite understanding) Reid, we've seen worse.
Reid: (softly) I know. (louder) I know we've seen worse, but...for the first time, I know. I look at them...I look at them, and I know. I know what they were thinking, and I know what they were feeling just before...
Morgan: It's called empathy. And it's a good thing.
Reid: (shaking his head) No, it's not. It's got me all messed up---I don't know how to focus, I can't do my job as well...so what do I do?
Morgan: You use it. Let it make you a better profiler. A better person.

The recording studio where the unsub takes his victims is located in Mount Vernon NY, which is located in Westchester County New York. At the climax of the episode when the latest victim is rescued, the local police responding are from the NYC PD. It should be the Westchester County Police department that responds.

When Reid sees the crime scene photos, he flashes back to his ordeal in Georgia when he was held captive by Tobias Hankel (2x15 Revelations).