behind the warp gate in the mystery machine part 1 (you have to have the thuderbolt move) go next too the tree there will be a hole use the tunderbolt move on it a lot of times and you will eventually go through the hole and end up where you start when you start a new game.
For the following codes to work you must have the game set to a holiday listed below.
Pause game play then hold L1 + L2 + R1 + R2 and quickly press Circle, Square, Circle, Square, Circle, Square(3), Circle(2), Square, Circle(3).
All FMV sequences:
Pause game play then hold L1 + L2 + R1 + R2 and quickly press Square(3), Circle(3), Square, Circle, Square.
Pause game play then hold L1 + L2 + R1 + R2 and quickly press Square, Circle(2), Square, Circle, Square.
Change the PlayStation2 system date to one of the following entries to see special things at the front yard and the mystic playground.
Information in this section was contributed by Tim Shifley.
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