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Claptrap's bounty item is his 2012 Character of the Year award from the Spike Video Game Awards. In the cutscene of him putting the bounty on the table for the tournament, GLaDOS says that it looks familiar. This is a reference to how Portal 2 was nominated for and won six awards at the 2011 Spike VGAs, with GLaDOS and Wheatley's voice actors, Ellen McLain and Stephen Merchant, also winning awards for Best Performance by a Human Female/Male respectively.
Claptrap bounty guide:
https://www.youtube.com/watch?v=wWpJi6omGek
2011 Spike TV Video Game Awards nominees:
https://www.prnewswire.com/news-releases/spike-tv-announces-2011-video-game-awards-winners-135392198.html
https://www.youtube.com/watch?v=wWpJi6omGek
2011 Spike TV Video Game Awards nominees:
https://www.prnewswire.com/news-releases/spike-tv-announces-2011-video-game-awards-winners-135392198.html
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Unused dialogue suggests that a themed set for The Walking Dead was planned but scrapped.
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Brock: Yeah, about that. I always heard that Pandora was some sort of lush jungle paradise.
Ash: Yeah, me too. What happened, did you guys run out of the, what was it - Cantgetium?
Brock: Nah, I think it was called "Macguffinite."
Claptrap: Ha. Ha. Very funny. Look, MY Pandora was first, got it?
Ash: All right, all right. Jeez. One question, though.
Claptrap: What?
Ash: What's James Cameron really like?
Claptrap: @#$% you.
This is a reference to the 2009 film Avatar by James Cameron which also features a planet named Pandora and contains the valuable mineral "unobtanium".
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This is a reference to actor Bill Farmer who used to provide the voice for Sam and who's also the voice of Goofy for most Disney media.
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Marty Mcfly and Doc Brown from Back to the Future were considered for the game but were cut due to them not being appropriate for a game with mature spoken content. Walking Dead characters were also considered but were cut because it would not be a thematic fit.
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