Pedantic-police: The $1-million little pile there has 10 bundles of $10,000 - that's not 1 million. (or are my eyes deceiving me?) Don't have the patience to figure out if that error is propagated to the rest...
http://www.pagetutor.com/trillion/calculations.html
It's just that dollar bills look pretty small next to feet. The perspective also makes it look smaller.
One million dollars takes up several duffel bags. Here's a picture I found that I can't verify but HuffPost thinks it's true:
http://images.huffingtonpost.com/2008-05-27-1MillionDollars....
Even if it's not 100%, it's much closer to that than the size of two shoes. Here is a picture from the same article of 100 million:
http://images.huffingtonpost.com/2008-05-27-100MillionCash.j...
The text right next to the picture says 100 bundles of $10,0000.