All Movies:
At the main menu, press Triangle, L1, Triangle, R1, Triangle, Square, L2, Square, R2, Square.
BGM Test Options:
At the main menu, press L1, L1, R1, R1, L2, L2, R2, R2, Square, Triangle
Alternate Endings:
Highlight 'Play' at the 'Opening' screen in the options menu, then hold R1 + L1 and press X
-or-
Highlight 'Play' at the 'Opening' screen in the options menu, then hold R2 + L2 and press X.
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Dynasty Warriors 3: Xtreme Legends Cheats, Codes & Walkthrough/Guide/FAQ for PS2 from Cheat Code Central
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Dynasty Warriors 3: Xtreme Legends Cheats at CheatingDome.com.