There are scenes after the credits
During the end credits, the song volume goes down at 55:33 and is eventually replaced by dialogues by two Ms. Crookshanks, a Mr. Philips and Adrian Veidt characters. This proceeds until 56:02 when the actual scene comes up. The scene is slightly more than 4 minutes long and shows what happened after Adrian's "escape" attempt. Scene also provides a bit more info on the 'Game Warden' character. Scene ends at 1:00:16.