All power-ups:
Pause game play then hold L + R and quickly press B, X, B, X, B, X(3), B(2), X,
B(3).
All warp gates:
Pause game play then hold L + R and quickly press X(2), B, X(2), B, X, B(3).
All FMV sequences:
Pause game play then hold L + R and quickly press X(3), B(3), X, B, X.
View credits:
Pause game play then hold L + R and quickly press X, B(2), X, B, X.
Holiday bonuses:
Change the Xbox 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