The Muppets Movie Hints for DVD
On the main menu, go down to bonus features but don't click on it. Normally when you press the right arrow button it will open the thing(eg. Play, scene selection, language etc.) but when you press right it will show an egg and if you click on it you will get to watch a secret feature about... Permits. Which isn't too amazing.
This was only tested on bluray and not DVD