I'm not sure if you are still answering questions in this area, Philippe, but I thought I'd give it a try. I've posted a possible easter egg in the hints area of GB. I didn't post it here because I wasn't sure you were still answering questions, but if you wouldn't mind reading it, I'd love to know if I stumbled onto a real easter egg. I think the game is great, by the way, and I think I would buy a CD from the singer who does the voice of Abby!
What lies behind you and what lies before you are tiny matters compared to what lies within you.
--Ralph Waldo Emerson