Gamezine seems to think so. Or at least they're happy to reiterate a message board post that thinks so.

...all debris on the ground is individually shadow-mapped in the PS3 game. This provides more depth for ground textures and creates a very impressive image for an open-world game. You'll find that both the Xbox 360 and PC (even when graphical effects are set to Very High) games look flat in comparison.

Note that the debris they're talking about aren't dynamic. It's just part of the way the ground is textured. Here are zoomed in versions of the comparison shots posted on the message board. The Xbox 360 version:

And now the PS3 version:

The difference looks awfully minor to me, but it's strange that the PS3 is the only system to get fake shadows in the ground textures. What's up with that? Not that I care. Prototype is one of the worst open-world action games I've had the misfortune to play since, well, Godfather II.