Warner Brothers have hidden a feature on this disc which can be found by doing the following:

1.) On the menu menu, wait for Scooby to be surprised by the ghost.
2.) He then drops a Scooby Snack in his mouth.
3.) Highlight the snack and press "Enter" on your remote. A Short featurette on adverse weather conditions during the filming of the movie will then be played.

Links:
Easter Egg by Richard Schuchardt