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* In [[2.20 What Is and What Should Never Be]], it is Mary's birthday and the date is December 5th.
* In [[2.21 All Hell Breaks Loose: Part One (episode)|2.21 All Hell Breaks Loose: Part One]], the [[Yellow-Eyed Demon]] shows Sam a vision of the night Mary died. It is revealed that she was killed
becuase she interrupted him as he fed his blood to baby Sam, and that she recognised him.
* In Supernatural [[Origins 1]], it is suggested that Mary's birthday is November 2.