This egg needs to be seen in slow motion, probably frame by frame. In the scene where Ursula is prompting Ariel to give her her voice, slow down right before she pulls out the contract. In regular speed, the camera moves too fast to see the words on the scroll, but if you go slow you can see several cool things. You can see many words, which I assume is in Latin, so maybe someone could translate. Then in about the middle of the scroll you see a Mickey symbol. This one has a face and is smiling! Cute!

I saw this on the last released DVD edition in 2006, I am almost positive it is on most copies.