When Prentiss was in JJ's office with Jordan Todd, she says she was the last person to join the team. However, she wasn't the last person. She appeared in Season 2 Episode 9 "The Last Word." Rossi appeared in Season 3 Episode 6 "About Face," which means David Rossi was the last person to join the team.
Rossi enters the interrogation room with his jacket neatly folded over his arm when Prof. Rothschild is about to leave. As he opens the door and sees Prentiss standing there, he goes back into the room while Prentiss takes his jacket to put it over her arm. Her jacket is over her arm the whole time, but the jacket is over the chair again when she leaves.
It was revealed in this episode that Reid had turned 27 years old the month before.
It is revealed in this episode that Reid has PhDs in chemistry, mathematics and engineering as well as BAs in psychology and sociology, and he is working on a bachelor's degree in philosophy.
Agent Jordan Todd: I'm gonna manifest happiness and calm for the rest of the day.
Prentiss: (laughs) Happiness and calm? At the BAU? That's... good luck with that.
Student: What did you study?
Rossi: Criminal Justice, but Sports Appreciation was full up at my community college.
Rossi: (to Prof. Rothschild) Killing someone or not killing someone is a choice. If those people die, it's because you chose to make it happen.
Garcia: There must be some sort of mathematical equation to do this. Should have paid more attention in algebra. Hmm... note to self: get Dr. Reid in here ASAP.
Reid: (referring to Prof. Rothschild) I never have any normal fans.
Rossi: (to Prof. Rothschild) Oh, and one more thing. I'm gonna be there when they strap you down for that lethal injection. And just before they hit the plunger, I'm gonna lean in real close and tell you to say hello to your scumbag brother.
Prof. Rothschild: You have something going on more important than me?
Rossi: My dry cleaning is more important than you.
Prof. Rothschild: (to Rossi) Some games are just intended to be played by higher intellects.
Morgan: Harming a person weaker than you doesn't take any special ability.
Prof. Rothschild: Neither does slamming your fist down on a table, but we all must do what we must do.
Garcia: There must be some sort of central grant database. I can't imagine the government just handing out money and not che... I'll look into it.
Rossi: ...but if you killed seven women without leaving a trace of evidence, why turn yourself in?
Prof. Rothschild: Imagine what the world would have missed if da Vinci never showed his work.
Reid: How many existentialists does it take to screw in a light bulb?
Rossi: (whispering) Don't.
Reid: Two. One to change the light bulb and one to to observe how it symbolizes an incandescent beacon of subjectivity in a netherworld of cosmic nothingness. (crickets)
Reid: Um, an existentialist would...
Rossi: Before he does his quantum physics knock-knock joke, do we have any other questions about opportunities in the FBI?
Rossi: "Man must evolve for all human conflict a method which rejects revenge, aggression, or retaliation. The foundation of such a method if love." Martin Luther King, Jr.
Rossi: "Let us consider that we are all insane. It will explain us to each other. It will unriddle many riddles." Mark Twain
A.J. Cook was credited, but not appear, in this episode because she was on maternity leave.
The character portrayed by Jason Alexander in this episode was modeled after the California serial killers Charles Ng and Leonard Lake.
Jason Alexander is credited as Special Guest Star in this episode.
Paul Michael Glaser, the director of this episode, appears as Detective Garrity.
Garcia: It's obviously Tank Girl.
"Tank Girl" is a British comic character created by Jamie Hewlett and Alan Martin. The comic's style was heavily influenced by punk visual art, and the character became quite popular, standing as a sort of cartoon mirror of the growing empowerment of women in punk rock culture.
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