The actors who play siblings Connie Galen and Georgie Galen, Nicholle Tom and David Tom, are real-life twins.
Shemar Moore and guest star David Tom worked together previously on The Young and the Restless.
In the "Birthright" episode, Rossi tells the retired local sheriff that the case in that episode had haunted him for 21 years. In the beginning of this episode, however, Rossi states that "20 years tomorrow three children woke up and found their parents murdered..."
Rossi tells John Caulfield in "Birthright" the charm bracelet he carries is to remind him of a case from Indianapolis where three children watched their parents get beaten to death on Christmas Eve. This was not the same story in "Damaged," in which the Galens had been axed to death in March.
Whether intended by the director or just happenstance, there is a sign on a building in several scenes that reads LEGACY, which is partially obscured by Prentiss' head and only the letters GACY can be seen. John Wayne Gacy was known as the Clown Killer and the unsub was wearing clown make-up.
Rossi: (to JJ, Morgan and Prentiss) Why do you care?
Prentiss: Because you do.
Morgan: What about Penelope?
Reid: I don't know.
JJ: (in sing-song) Garcia and Kevin sitting in a tree... (she walks away)
Morgan: Get outta here. Are you serious?
Prentiss: Just when I thought nothing scandalous was ever gonna happen around here. (Morgan walks away)
Reid: What? What does that mean?
Prentiss: Didn't you hear JJ?
Reid: The song meant something? No. No, I missed it.
Prentiss: It... it... it... You know what? Never mind.
Chester Hardwick: Is that true? That I never had a chance?
Reid: (walking out the door) I don't know... maybe.
Connie Galen: (handing the charm bracelet back to Rossi) Agent Rossi, I'd like you to have these. Is it OK if I call you sometime? Just to let you know how we're doing?
Rossi: (smiling) Anytime, kiddo, anytime.
Morgan: I can't believe people actually pay good money to play these fixed games.
Morgan: Excuse me?
JJ: It's not people. It's men.
Morgan: Is that a fact?
JJ: Only a man would waste 50 dollars trying to win back a three-dollar stuffed animal.
Rossi: When we arrived on the scene, before any of the other units got there, I could hear them. Before I even got out of the car. It was a warm morning and the windows were open in the upstairs bedroom. And their voices floated out into the street. They were crying and calling for their mommy and daddy. Three terrified children screaming for their murdered parents. I've seen so much death and pain, but it's been 20 years and I can still hear them screaming every night. Crying. If I can't tell them for sure that whoever is responsible will never do it again, that screaming might never stop.
Rossi: Did anything come back yet on that print?
Garcia: No. No matches. Nothing on file. Sorry.
Rossi: What about my notes?
Garcia: Those I have. Do you have a PDA cause I can send them to you.
Rossi: What's a PDA?
Garcia: It's a personal digital.. never mind.
Garcia: You want to straighten out Agent Rossi?
Kevin: No. What I want is for me to be able to come up here and kiss my girlfriend. And if that means I have to talk to him, then that's what I'll do.
Garcia: Girlfriend? Kevin?
Garcia: If you get within 100 feet of Agent Rossi, I will unleash an unrecoverable virus on your personal computer system that will reduce your electronic world into something in between a Commodore 64 and a block of government cheese. Call me later.
Garcia: (as Kevin sneaks up behind her) What are you doing here?
Kevin: I work here too.
Garcia: Yeah, in your own office two floors down.
Kevin: I can't come over and visit?
Garcia: Are you insane?
Kevin: What's wrong?
Garcia: Haven't you forgotten last night?
Kevin: I will never forget last night.
Prentiss: (discussing Rossi) He might need our help.
Garcia: He didn't ask anyone for help.
Prentiss: Penelope, Rossi is a guy who color codes his handwritten notes in his notebooks: blue pen for evidentiary items, red pen for supposition and theory. The guy is a fussy, anal-retentive neat-freak who never leaves anything out of its place. (pointing to the mess in Rossi's office) I would say this is a scream for help.
JJ: So, you were in the shower with Kevin Lynch?
Garcia: Come on, JJ. I'm being serious. I need your help.
JJ: With what?
Garcia: Agent Rossi. We're not supposed to date fellow Bureau employees.
JJ: From what I hear, Rossi is the reason most of these fraternization rules even exist.
Rossi: What kind of a researcher are you?
Garcia: I'm not a researcher. I'm a technical analyst.
Rossi: What the hell does that even mean?
Kevin: (entering room, naked, just out of the shower) You left the middle of my back totally unloofahed.
Garcia: (emerging mumbling from a steaming bathroom after a knock at the door) …no acceptable excuse for violence, but for you I am making an exception! (opens the front door) Oh my God, Agent Rossi!
Reid: I find that I do some of my best work under intense terror.
JJ: I can make anything a BAU case if I want to. It's all about paperwork, and I know the paperwork.
Rossi: "Within the core of each of us is the child we once were. This child constitutes the foundation of what we have become, who we are, and what we will be." Neuroscientist Dr. R. Joseph.
Hotchner: "There is no formula for success, except perhaps an unconditional acceptance of life and what it brings." Arthur Rubinstein.
After the strike was settled, Ed Bernero wrote the script for this episode, which could be produced quickly and required less time-consuming location work than usual due to time constraints. The working title was "Recall," and it was written in one week, but was subsequently renamed "Damaged."
The song heard at the end of this episode was "We'll Get By" by Gary Louris.
Prentiss: Like Lennie in Of Mice and Men.
Of Mice and Men was written by John Steinbeck and told the story of two migrant farm workers, Lennie and George. Lennie has the mind of a child in a large man's body, who accidentally kills a woman, and George is his devoted friend who takes care of him and cleans up after him.