The date in this episode is May 14th as Gideon writes it down in his murder book at the end of the episode.

Gideon: So, it's an annual evaluation, who cares?
Hotch: It's six months early, Jason, it's... not a routine evaluation. I think it's an assessment of the BAU. They're redistributing funds, they're making cuts in all departments.
Gideon: So, what are they gonna take, the jet? I prefer trains, anyway.
Hotch: Well, I think we may lose more than that. It's been a hard year for us, Jason. You know, what happened to Morgan in Chicago. We both know about Reid's issues, Elle Greenaway suspect killed, it all adds up.

Gideon: Hey, Hotch. You're the best unit chief I know.
Hotch: Jason, I'm the only unit chief you know.

Gideon: I choose my friends for their good looks, my acquaintances for their good characters, my enemies for their good intellects - Oscar Wilde.

Erin Strauss: I've never seen you like this.
Hotch: You've not seen what I've seen.
Erin Strauss: You chose the BAU.
Hotch: True. I enjoy my work even when in the pursuit to understand why a person feels the compelling need to brutally torture, murder, dismember a child, mother, father, an entire family. The unsubs devoid of any morality, humanity, remorse. When caught, often come to believe that we're the only ones who understand them. And, they're right, we do. Otherwise, how could we catch them?

Garcia: Ohhh, JJ! It's Friday night. The cute guy from counter terrorism, three cocktails in, I am looking at second base so this better be good.
JJ: It's far from good.

Garcia: (talking to herself) Nervous whistle, stop it. Stop it, everything's-everything's cool, Garcie. Gorgeous tech kitten found in lonely, dark parking lot. Throat slashed ear to ear, horrific, tragic with the very files of one of the most prolific serial killers ever. Tonight, he remains at large, the blood of Quantico's finest... (Gideon enters the car) Oh God! Oh my God!

JJ: Looks like the first page has been ripped out. You can only really see what's left on the side of the page but it's definitely Gideon's handwriting. Looks like some kind of a list.
Hotch: It's his murder book.
Emily: Murder book?
Hotch: When he opens it to the first page, it reminds him why he does what he does.
Reid: It's a list of all the people he's ever saved - names, dates, personal details.
Hotch: And, now, Frank has the list.

Gideon: (to Garcia) Mimus polyglottos... mockingbird. They provided insights into the origin of syntax. Essential first steps into the evolution of human language. We stand any chance of stopping him, we need to understand the evolution of Frank.

Tracy Belle: Please, Mr. Gideon. You saved me once, don't you remember?
Gideon: Of course I remember you, how could I ever forget you? Tracy, everything's gonna be alright.
Tracy Belle: I'm scared, I want my mommy. Please. Please.
Frank: Jason?
Gideon: You son off a bitch. I swear to you I will find you and I will stop you.

Emily: Did Gideon say where he was going?
Hotch: He'll be here.
Emily: In what capacity?
Hotch: What's that supposed to mean?
Emily: As an agent or an executioner?

JJ: Whoa, hey. No matter what happens this time, we don't split up. Clear?
Reid: Crystal clear.

Gideon: You're not a rare bird, Frank. Nothing special about you. Common, pedestrian, boring.
Frank: Jane, this world, we don't fit in it. No-one understands what we are.
Gideon: Jane, he sees you as his mother. Nothing more, nothing less.

Hotch: Once again, the team had battled a monster... and won.
Erin Strauss: The future of the BAU is not in the balance here. The residual impact as a result of the investigations into the crimes and criminals you pursue is. Every cause has its effect.
Hotch: You think I don't know that?
Erin Strauss: I believe you are no longer effective in your post.
Hotch: Modern furniture, strategically placed magazines, the framed diplomas, the art on the wall are all in conflict with your family photos. You have three children but you favour the middle one, your son.
Erin Strauss: What do you think you're doing?
Hotch: Of course you love all your children but not like your son.
Erin Strauss: That's enough.
Hotch: The bonsai you obsessively nurture is to compensate for feelings of failure as a mother...
Erin Strauss: Agent Hotchner, I said that is enough! My position is not in question here. As your superior, I am questioning your ability to lead your team.
Hotch: My team, let me tell you about my team. Agent Morgan fought to protect his identity from the very people who could save him. Why? Because trust has to be earned and there are very few people he truly trusts. Reid's intellect is a shield which protects him from his emotions and at the moment, his shield is under repair. Prentiss overcompensates because she doesn't yet feel she's a part of the team, she needn't worry. Every day, Agent Jareau fields dozens of requests for our team and every night, she goes home hoping she's made the right choices. Garcia fills her office with figurines and colour to remind herself to smile as the horror fills her screens and Agent Gideon, in many ways is damned by his profound knowledge of others., which is why he shares so little of himself yet he pours his heart into every case we handle.

Hotch: I stand by my actions and I stand by my team and if you think that you can find a better person for the job, good luck.
Erin Strauss: Agent Hotchner.
Hotch: How do I know you favour your son? I'm good at my job.

Erin Strauss: I put you in the BAU. I knew how badly you wanted it, everyone did. You were never exactly shy about letting us know. But, there were those who didn't think assigning you to the BAU was a good idea. They thought you were too reckless. I believed in you, however. It's time to pay back the faith I had. Your team is in trouble. They've lost sight of the big picture. I believe they are reckless and at times, out of control. It's time for Agent Hotchner's career to come to an end. And, if you want to stay in the BAU, Agent Prentiss... you're going to help me make that happen.

After JJ arranges the photos on the desk, Hotch enters the room and speaks. As the camera pans with Hotch in shot, it's obvious that this section has been flipped horizontally due to Hotch's side parting switching to his right when normally it's on his left.

Hotch: Well, I think we may lose more than that. It's been a hard year for us, Jason. You know, what happened to Morgan in Chicago. We both know about Reid's issues, Elle Greenaway suspect killed, it all adds up.

Morgan was arrested in Profiler, Profiled, Reid's issues began when he was tortured in The Big Game and Elle's suspect was killed in Aftermath.

Leopold: They say beauty can cover a multitude of sins...
Morgan: What?
Leopold: ...while underneath it all, we all look exactly the same.

Leopold repeated what Frank said to Morgan in the diner in No Way Out.

Frank: We at the BAU like to follow up on our victims.

The flashback that followed was from The Fisher King (2).

JJ: Hotch, Tracy Belle and her family relocated to McLean, Virginia, eight months ago.

The flashback that's shown was from The Boogeyman.

JJ: Whoa, hey. No matter what happens this time, we don't split up. Clear?
Reid: Crystal clear.

This is a reference to The Big Game where JJ and Reid split up as they looked for the unsub which subsequently led to Reid being captured and tortured.

Hotch: Agent Morgan fought to protect his identity from the very people who could save him. Why? Because trust has to be earned and there are very few people he truly trusts.

This is a reference to Profiler, Profiled where Morgan did not want the team to delve into his past.