During the Credits (spoilers)
The beginning of the credits has an extra scene with the Undercover Brother getting his convertible washed at the car wash. Towards the end of the credits there is another extra scene that shows the White She Devil interrupting Undercover Brother when he’s with Sistah Girl.
After the Credits
There is a quick sound clip of Eddie Griffin saying “Solid”, but there are no other extras after the credits of Undercover Brother.
Special thanks to MovieMonkey for the stinger confirmation!