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The title of the episode is a combination of "[http://www.imdb.com/title/tt0337978/ Live Free or Die Hard]" and "[http://www.imdb.com/title/tt1099212/ Twilight]". [http://www.urbandictionary.com/define.php?term=Twihard Twihard] is a pejorative term for an obseeive fan of the "Twlight" series.
There are multiple references to the [http://en.wikipedia.org/wiki/The_Twilight_Saga_(film_series) Twilight series] throughout this episode. The two characters who meet at the Black Rose in the beginning of the episode are named Robert and Kristen. These are references to actors [http://www.imdb.com/name/nm1500155/ Robert Pattinson] and [http://www.imdb.com/name/nm0829576/ Kristen Stewart], who play the lead roles in the Twilight movies. A large part of Robert and Kristen's conversation at the Black Rose in the beginning is also a word-for-word copy of several conversations in the Twilight Series.