The face of The Hulk is a computer generated image of Erik Bana, Jennifer Connelly, and director Ang Lee combined into one.

The powers that David Banner gains match those of The Absorbing Man, a character from Hulk's Rogues Gallery in the comic (though in the comic, he was a convict named Carl "Crusher" Creel).

When Stan Lee first created the Hulk, he wanted the Hulks' skin to be gray just like classic monster movies. When making the first comic of the Hulk, the gray for the Hulk was either too dark or too bright. Stan Lee then decided to use green for the Hulk's skin color since green was not being used for other Marvel superheroes.

For the 70's TV show, the main character was named David Banner, as Bruce was thought to be too feminine for a leading male's name, but in this movie version, Bruce's father is called David Banner.

During the Hulk's first transformation when he lifts the Gamma Ray apparatus over his head (which is spherical) he looks just like Atlas carrying the world.

When David Banner is first recognizing his powers in the lab, and is watching his hand become various different textures, the very first skin texture shown resembles that of 'The Thing' from Stan Lee's 'The Fantastic Four.'

All of the Hulks movements, from running to fighting, were done by the director,Ang Lee, wearing a motion capture suit.

Stan Lee says that the Hulk was inspired by Frankenstein's monster and Dr. Jekyll/Mr. Hyde.

Stan Lee, who co-created the Hulk, and Lou Ferrigno, who played him in the 70's TV show, have cameos as a pair of security guards in the beginning of the film.