Sure, but it's not like running your game with the debug menu open is the usual way it runs. The debug menu is supposed to show info about the stuff you're debugging, not itself.
Simple, get the count of everything, then subtract the count of the stuff it has direct local references to, i.e. the bitmaptexts and the background quad. I doubt it can ever get it wrong that way. It doesn't matter for performance which is exactly why it shouldn't be shown - to make the display less misleading imho.
All I know is beginner bone powder sells for $500 a pound.