There are a couple more eggs in JJ1. But they all involve cheats, but one I can mention: When you finish an episode with a cheat, before the ending animation you get a screen with Jazz and a turtle playing poker, with Eva as a Diva, all Wild west style. Jazz won the game and shows his cards, but the turtle draws a gun and says he cheats. :P

And JJ2 doesn't have eggs as far as I know.

- JelZe GoldRabbit =:3