Change the Gamecube system date to one of the following entries to see special things at the front yard and the mystic playground.

January 1: Fireworks
February 14: Hearts on Scooby Snacks
March 17: Green fountain water and smoke from chimneys
July 4: Red, white, and blue fireworks, fountain water, and smoke from chimneys
October 31: Giant bats over courtyard door for decoration
December 25: Snow
December 31: Fireworks