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* [[Billie]] reveals that [[Death's Scythe]] slowly kills anything it cuts, even if it's not a killing blow, as their bodies rot away. This is reminiscent of the [[Lance of Michael]] from [[12.12 Stuck in the Middle (With You)]] which causes angels to die slow and painful deaths as their bodies deteriorate.
* Billie references [[Castiel]] stabbing her in the back and killing her from [[12.09 First Blood]].
* Billie scrapes her scythe along the wall as she stalks Dean and Castiel in the Bunker. This was previously seen in [[1.07 Hook Man]] as [[Jacob Karns]] stalks his victims and [[7.18 Party On, Garth]] as the [[shojo]] stalked Lee Baxter.
* Castiel uses the [[angel banishing sigil]] to keep Billie at bay, drawing it with his own blood just as he first drew it to banish [[Zachariah]] in [[4.22 Lucifer Rising]]. This also appears to be a nod to [[Bobby]] calling [[Death]], the [[Four Horsemen of the Apocalypse|Pale Horseman]], "The Angel of Death" in [[5.10 Abandon All Hope...]], further clarifying how the sigil can keep the current incarnation of Death at bay.
* Castiel's speech before being taken to [[the Empty]] is very similar to the one he gave while dying in [[12.12 Stuck in the Middle (With You)]].