Spot the difference

The last time I was in the Barnes & Noble in Union Square in New York City, I was pleasantly surprised to see Boys of Steel: The Creators of Superman face out. This is typically a small rush for most authors, and some manufacture this rush on their own if a bookstore has not done it for them. (I don't think this is illegal.)

Can you spot the difference between these two photographs?

as first seen:

before I left: