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"First Blood" is a reference to a song by [https://en.wikipedia.org/wiki/AC/DC AC/DC], as well as the 1982 film [https://en.wikipedia.org/wiki/First_Blood of the same name], where Vietnam veteran John Rambo is also pursued by the authorities through the woods.
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'''Castiel:''' Come on, Crowley, the police took them. You have people in the government. You have spies.<br>
'''Crowley:''' I do. But whatever's happened to Moose and Squirrel, apparently it's above their pay grade.
:''The nicknames "Moose and Squirrel" used by Crowley for Sam and Dean throughout the series is a reference to the 1960's animated TV show, [https://en.wikipedia.org/wiki/The_Rocky_and_Bullwinkle_Show Rocky and Bullwinkle].''
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