Trace Memory Cheats :
ThE Obvious Easter Egg
This is the most obvious easter egg. The DTS is actually a prototype of the DSi. Nintendo probably knew they were coming up with a DS with a camera. Maybe to begin with they didn't intentionally know how it would look like so they used the original DS structure. If you still don't believe me a background music from Trace Memory was remade and remixed as the photo album music.