Are there any differences between Okami and Okami HD apart from the graphics?

Solution 1:

Not only does it seem you can no longer acquire demon fangs via loading screens, but also via the reflector sub-weapon attack. So far this is all I can find.

Solution 2:

One more change: both the Wii version and the HD PS3 version do not have the original song from the closing credits ("Reset" by Ayaka Hirahara). It was removed for some pretty stupid reasons.

Solution 3:

It seems that the only changes are really the graphics and the added trophy and move support. Even reviewers who played the game on PS2 haven't mentioned any changes apart from that (e.g. Eurogamer Review).

Solution 4:

Combining all of the previous answers into a single post...

• The paw-print loading screen mini-game was removed (presumably due to faster load times)
• The original PS2 closing credits theme "Reset" was restored (Preciously excluded from Wii release for legal reasons)
• Collectable trophies were added
• Support for the PlayStation Move controller
• Improved graphics and 1080p widescreen support