Inserting disc 2 of the game into a CD player will let you listen to the game's end credits song.
Several changes were made with regards to gameplay when the game was localized from Japan to US:
-Many enemies now give out more EXP.
-The L1 and R1 functions are reversed.
-A soft reset button combination was added to the US version.
-The default movement was changed from walk to run.
Many instances of breaking the fourth wall were added to the US version's text. The Japanese version had no such text whatsoever.
The game's opening montage was sung by Ayumi Hamasaki, who is the best-selling Japanese solo artist of all time.