It is possible to have a mirror match in Versus mode by holding Select when choosing a Digimon. This method is not mentioned in the game or the manual.

It is possible to change some of the tamers' avatars to represent their old appearances from the anime by holding L1, L2, R1 and R2 down at the same time while choosing a character. Interestingly, when choosing Wormmon/Stingmon it's possible to change Ken's outfit to his previous Digimon Emperor outfit but this does not apply when choosing Imperialdaramon Paladin Mode. This could be due to the fact that Ken had been reformed before partnering up with Davis and Veemon, creating the Imperialdramon.