From the first disc's main menu, go to the 'Special Features' where you can select different kingdoms. Apart from the obvious kingdoms, the entrance to the legendary 10th Kingdom can also be found here. When bringing up the screen, your cursor is located on the 1st Kingdom. Press the 'Left' arrow button on your remote control to get to the 3rd, and then press the 'Up' key to highlight the 4th Kingdom. Now press the 'Right' arrow key and you highlight a small castle. Press 'Enter' now and you will see the text screen on the 10th Kingdom.
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Within this text screen, press the arrow 'Up' key and you will highlight the magic mirror. If you press 'Enter' now, you will get to watch a short clip showing two of the characters entering the 10th Kingdom.
All easter eggs were generously submitted by Bjorn_K