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Production Art:
On the DVD that comes with the game, hold down your Left button at the main menu until the art gallery appears.
Reported by: PugDaddyD

Interface:
On the DVD that comes with the game, remain idle at the main menu. The Marine will begin to threaten you very comically for not hitting play. He will go through three different routines before it repeats.
Reported by: PugDaddyD