now that's just interesting... i've heard that some games have stuff like this but only one i've ever actually discovered is the song "stan" by eminem from magna carta ps2 version
I didn't realise the Japanese had such a fondness for subliminal images. Not game related, but the most extreme use of subliminal images has to be in the Al Pacino flick 'Cruising' - I'll say no more... but details of these images (which actually slipped by censors in some cases - are listed on imdb)
I just checked my Limited Edition copy of it. It was there, my mind was blown. And Tatsujin, I thought the same thing when i was reading this thread. Awesome find Yakumo!