Bonus Feature:
While on the Main Menu, there are two "pots" in the background that are not on the flames. A black rat pops out briefly from behind the one on the right, then after a short while, pops out from behind the one on the left. At either of these times, if you select the pot the rat is behind, you will be treated to one of two short clips. One is a very short promo for Rat Poison (left pot), and the other a brief clip regarding Brad Bird and the movie's title (right pot).

Bonus Feature:
Go to the "Scene Selection" section, click on the flower on the wedding cake, just above the rat to find this egg.