I know...I have a page/blog dedicated for all those little clues. It's called "Miroku o sagase (Find Miroku)". I haven't posted it yet though...I'm going to do it for every episode since it seems there's at least one new one every time.
For those who are clueless as to why 369=Miroku, it's something that Japanese people do. They take the top sounds of the numbers and create names or codes with it. So 3=Mittsu which is where "Mi" comes from, 6=Roku is where "Ro" comes from, and 9=Ku (or Kyuu) is where "Ku" comes from. Pretty cool ne?

I'll see if I can put a link here later or something...