Thanks to EK Rivera For This Info:
There are at least two easter eggs on the CB: KOHD Region 2 DVD. They’re on the Extras Menu in the flying face. If you’re using a DVD-Rom, roll-over the eye and it’ll turn from red to black (or maybe vice versa). When you click on it, you’ll get a trailer with a voice-over by Kouichi Yamadera about the movie. If you roll over the teeth on the right hand side, you’ll get the same movie trailer, but with a voice-over by Aoi Tada.