Bonus Features:
From the main menu of the disc, go to the "Special Features". When you get there, press your Right button button to highlight the eyes on the bottom of the skateboard. If you press your Enter button now, you will be taken to a small documentary that shows you how skateboarding got popular.

There's yet another hidden feature on the disc however. Press the press your Down button key until you highlight the skateboard in the title on the main menu. Press your Enter button now and you will be treated to a short clip where the cast and the crew tells you what they think the term 'Gleaming The Cube' means.