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David Fury says in the DVD commentary that the original title of this episode was "Mother and Son". But Drew Goddard, the co-author, made him realize it was not only about the Woods, but Spike and his mother, Buffy and her father, Giles and the lies each parent told his/her son/daughter: Nicky said she loved Robin, but she didn't leave the slaying (as Spike mentions); Spike's mother was always the loving one, but when she was turned into a vamp she said all those things to him. Spike thinks it was the demon inside talking, but he couldn't be sure; and Giles, of course, the conspiracy to kill Spike
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Drew Goddard was asked by David Fury to co-write the episode since David was short on time to write the whole episode and prep for directing it.
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Buffy tells Wood "The mission is what matters," which is what Wood's mother told him before being killed by Spike.
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Watch the scenes between Giles and Buffy in the cemetary. In most of the shots they do not appear together. This is because the scenes with Buffy were shot separately from the scenes with Giles because Anthony Stewart Head was unavailable. His scenes were shot 10 days later.
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The original script lists Spike's mother's name as Anne, which is also Buffy's middle name. The actress also bears a slight resemblance to Sarah Michelle Gellar. These facts provide some more insight into Spike's obsession with Buffy. Thematically, this also further connects Spike with Wood, who early in the episode remarks that Buffy reminds him of his mother.
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This episode can be noted as the sequel to Season 5's "Fool For Love", because the flashbacks of Spike's past continues right where "Fool For Love" left off once Spike was sired by Drusilla.
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Kristy Wu - Chao Ahn, Sara Hagan - Amanda, Felicia Day - Vi and Clara Bryant - Molly do not appear in this episode.
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According to the season 7 novelization: In this episode Dawn recieves the Phone call from Angelus that was made in the Angel episode "Salvage." The scene takes place right after the teaser.
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This marks the final appearance of Juliet Landau as "Drusilla" on this series.
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The "brain matter" that the janitor was cleaning up in the beginning was probably the nervous, severely stressed-out kid in "Storyteller" who (off-screen) exploded, causing Buffy to say: "Should have had that foot rub."
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The network advertises for the first time during this episode that "Buffy's Final Hour" is coming.
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The definition of prokaryote, the name of the stone put in Spike's head, is an organism of the kingdom Monera (or Prokaryotae), comprising the bacteria and cyanobacteria, characterized by the absence of a distinct, membrane-bound nucleus or membrane-bound organelles, and by DNA that is not organized into chromosomes. Also called moneran.
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Buffy's line to Giles, "Have you heard my speeches?" is a nod to the online fan community who have criticized the number of times Buffy gives speeches.
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Unlike at the end of Season 5, Buffy is now willing to sacrifice Dawn (or any of her friends) to save the world. This revelation sheds a lot of new light on what the First/Joyce told Dawn in "Conversations with Dead People".
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Anya makes reference to the time when she slaughtered a fraternity house in 'Selfless'.
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William reads poetry to his mother about Cecily, who was played by the same actress as Halfrek, who confirmed that they were the same character as well.
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When Spike's mother was staked by Spike, she give her last human smile to Spike before she turned to dust.
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Apparently, Giles has a personal library both large enough and complete enough to be used as a school library. It is most likely filled with the books on vampires and the occult that were saved from the Mayors attack in the season 3 finale.
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Willow left to Los Angeles to help the team of Angel in "Orpheus."
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'Orpheus' and 'Lies My Parents Told Me' were played switched around since Willow is in LA on the Angel episode which was aired earlier.
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It is probable that Spike's (William's) mother had tuberculosis, a disease which causes victims to cough up blood as their lungs deteriorate.