During the Credits
There are black and white illustrations of the characters shown.
After the Credits (spoilers)
There are multiple random extra scenes that are shown after the credits. The extra scene starts off with Batman flying away in the Batwing as the camera then tilts down to show a hand reaching out of the water. While the scene begins the same, the hand is random and is either the hand of Bane, Killer Croc or Scarecrow.
Special thanks to JENSEN and xMort for the stinger submissions!