go to the Video Game & Still Galleries menu page. Using your remote, press "10+", "1" (or "11" depending on your player) and wait for the pause as the player accepts the input (note that a small box next to R2-D2 will illuminate if you're on the right track). Then press "3" and wait for the pause. Finally, press "8".
All easter eggs were generously submitted by Bjorn_K