This might also be an Easter Egg because of the simplicity of the glitch. In the PAL Version of the game, before the Title Screen there is a Language selection, and by exiting it with the triangle button, all of the words will be turned into slashes and hyphens, but when doing adventure Mode, all the bosses (except Ripper Roo) have swapped heads Komodo Joe has Oxide's head, Papu Papu has Pinstripe's head, Pinstripe has Komodo Joe's head, and Oxide has Papu Papu's head.
