During the Credits
There are no extras during the credits of The Incredible Hulk
After the Credits (spoilers)
There are no extras after the credits of The Incredible Hulk; however, there was supposed to be an extra scene after the credits, but it was moved to before the credits. The extra scene right before the credits shows Tony Stark joking with General Ross about how he prefers using technology instead of biologically altering humans to make them into super soldiers. While Tony Stark does make his cameo at the end, Captain America and Nick Fury are nowhere to be found.