The game features a sound test mode, though this went largely unnoticed until well over a decade after the game came out due to the obscure way in which it is accessed. You must first complete the game, watch the ending cinematic, and wait for the game to reset itself. You must then open a saved game and hold start and down while Simone finishes talking and the screen fades out. The only way to exit this mode is to reset your console.

The North American version of the game displays an incorrect border on the dialogue box, but it still functions correctly.