In the 'Special Features' section press the UP arrow on your remote or move your mouse to highlight the skull's eyes on the skatboard to view 'How did skateboarding get it's start?' interview with Stacey Peralta.
On the Main Menu screen, highlight the sillouette of the skateboard directly below 'Gleaming' to view 'What does Gleaming the Cube mean?'.
All easter eggs were generously submitted by SirDonk