Howard reveals he has transient idiopathic arrhythmia.
Leonard reveals that his middle name is Leakey.
Leonard: What's that?
Sheldon: Tea. When people are upset, the cultural convention is to bring them hot beverages. (a pause as he tries to think of what to do next, then he says awkwardly) There, there. (another pause) You wanna talk about it?
Sheldon: Good! "There there" was really all I had.
(the guys are all wearing the same Flash costume)
Sheldon: This is why I wanted to have a costume meeting!
Leonard: We all have other costumes. We can change.
Raj: Or we can walk behind each other all night; it'll look like one person going really fast!
Howard: No, this is a boy girl party, this Flash runs solo!
Leonard: How about this: nobody gets to be the Flash; we all change. Agreed?
Raj, Howard, Sheldon: Agreed.
Leonard: I call Frodo!
Raj, Howard, Sheldon: DAMN!
Girl: So what are you supposed to be?
Sheldon: Me? I'll give you a hint: (imitating the Doppler effect) Neeeeeeeuuuum!
Girl: A choo-choo train?
Sheldon: Close! Neeeeeeeeuuuum!
Girl: A brain damaged choo-choo train?
Leonard: (after Kurt sees Penny kissing him) That's right. You saw what you saw. That's how we roll in the Shire.
Leonard: I understand your impulse to try to physically intimidate me. I mean, you can't compete with me on an intellectual level, and so you're driven to animalistic puffery.
Kurt: Call me a 'puffy animal'?
Leonard: Homo habilis discovering his opposable thumbs says what?
Wolowitz: Check out the sexy nurse. I believe it's time for me to turn my head and cough.
Penny: Why can't all guys be like you?
Leonard: Because if all guys were like me the human race couldn't survive.
This episode's end titles has Chuck Lorre's Vanity Card #191.
The German episode title is "Das Mittelerde-Paradigma", the Italian title is "Il paradigma della Terra di Mezzo", the Spanish title is "El paradigma de la Tierra Media", and the Mexican title is "El paradigma de la Tierra de Enmedio", all exact translations. The French episode title is "Les Allumés d'Halloween", meaning "Halloween Crazies".
Music: "Mama's Room" by Under the Influence of Giants
Original International Airdates:
Turkey: October 21, 2008 on CNBC-e
Czech Republic: May 12, 2009 on Prima COOL
Germany: August 15, 2009 on ProSieben
Slovakia: August 24, 2011 on Markiza
Howard mentions there being a "great show on VH1 about how to pick up girls," referring to their reality series, The Pick Up Artist.
Middle Earth is a reference to the fantasy world created by J.R.R. Tolkien for his various works.