Those of you who have it, take a nice long look at the track list and see if there's anything you haven't noticed before.

And when you're satisfied that there isn't, take a look at this image.
http://thechive.com/2010/05/26/the-batman-soundtrack/

Man, I never notice stuff like that. XD That's a pretty cool find. Now I need to go show it to someone else so I can impress them. :3