Get a "Gold" rank on the indicated mini-game to unlock the corresponding bonus. Then while playing the game, press Start, select the "Secrets" option, then choose "Cheats" to access any unlocked options.

Indiana Jones Hat: Indiana Jones mini-game
Pants: Lord of the Rings II mini-game
Web Site Clue A: Matrix I mini-game
Web Site Clue B: Braveheart mini-game
Web Site Clue C: Lord of the Rings I mini-game
Web Site Clue D: Matrix II mini-game