The sword Sheldon and Leonard are trying to purchase at the beginning of the show from Game Of Thrones is Longclaw, sword of Jon Snow.
Amy: I don't understand. What difference does it make if Leonard goes to Wil Wheaton's party?
Penny: Wil Wheaton is Sheldon's mortal enemy.
Amy: "Mortal enemy?" Sheldon, I know you're a bit of a left-handed monkey wrench, but you really have a mortal enemy?
Sheldon: In fact, I have 61 of them. Would you like to see the list?
Stuart: Okay, if you're going to question the importance of an actor's signature on a plastic helmet from a movie based on a comic book, then all of our lives have no meaning!
Sheldon: You've already signed something for me, Brent Spiner—your name on my list. From this moment on, you are my mortal enemy!
Wil Wheaton: Don't worry, it doesn't take up a whole lot of your time.
Brent Spiner: (on a Star Trek: TNG action figure) I haven't seen one of these things in years. Remember how we used to make these things look like they were masturbating?
This episode's end titles has Chuck Lorre's Vanity Card #359.
Wil Wheaton commented over his Twitter account (@wilw) that some dressing on the set used for his party are from his actual house, including the Velvet Wesley Crusher picture.
Bill Prady (@billprady) tweeted the day after broadcast that the two people in the background chatting with Stuart were Star Trek writers D.C. Fontana and David Gerrold. He later added that the sword purchased at the start of the episode would become part of the permanent set dressing for Leonard and Sheldon's apartment.
Principle filming for this episode was done September 20, 2011.
International Airdates: Australia: October 24, 2011 on Channel 9; Czech Republic: June 25, 2012 on Prima COOL; Turkey: September 25, 2012 on CNBC-e; Finland: February 4, 2013 on Sub
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