Return Of Ishtar:
Go into the Museum and go into the room where the Return of Ishtar room is.
Upon entering the room press right,left,up,down,circle (this has to be done fast
like a special move in a fighting game) If this is done correctly you will have
a hidden version of the Return of Ishtar game.

Secret Intro:
When the game is loading(you know when you see NAMCO fly by)hold down L1 and R1
at the same time and you will see a FMV intro from the Genji and Heiki Clan
instead of the normal intro.