The Incredible Hulk Easter Egg - Hulk Smashers

1) right at the begining of the movie titles we see various documents some which read nick fury and tony stark (ironman) but well known marvel characters.

2) stan lee, founder of marvel, can be seen as the guy who drinks the bottle of pop that some of bruce banners blood went into.

3) lou farrigno (who played the hulk in the tv series) plays the school security guard.

4) tony stark appears right at the end of the movie talking to the general saying he would help him, possibly hinting at an ironman vs hulk movie and at making the hulk-buster ironman seen in various cartoons and comics.