Click on the "Special Features" menu, and highlight "Recommendations" and you can find trailers for: Babe, Dragonheart, and The Flintstones (1994).
Now, the strangest easter egg actually requires a few DVD requirements. THIS WILL ONLY WORK IF YOU DO NOT HAVE A DTS SOUND CARD IN YOUR DVD PLAYER AND/OR A DTS SOUND SYSTEM!! First, select the DTS sound icon from the Languages menu. Another submenu will come up saying 'are you sure you want DTS?' Click yes. It will return you to the main menu. Once you start the movie and see the DTS sound trailer, you will not be hearing the normal sounds from the DTS logo. In fact, you will hear a little section of an audio commentary from the movie Dragonheart with a man talking about Draco and what he means to him.
All easter eggs were generously submitted by SirDonk