In Okami, there used to be a mini-game in the loading screen, that if you pressed a particular button when a paw-print appeared, and you got all of them in a row, it would show a Demon Fang instead of Issun:
Is this game still in Okami HD? I've tried mashing every button (except Select and Start) to no avail.
Also, I can't quite remember, but did this actually give you a Demon Fang in the original game?
EDIT: I have found this article in the wiki, but as it states it needs to be completely rewritten, so I wanted to verify it.