Talbot: You know, consciously, you may control it, but subconsciously, I bet that's another story.
Near the beginning, when Banner arrives at the lab with his helmet on, he removes the helmet when he sees Betty. A close-up of his face is shown and his hair is messy with part of his fringe on his forehead. Betty is shown quickly, then the same shot of Banner is shown again, but this time his hair is perfect.
The face of The Hulk is a computer generated image of Erik Bana, Jennifer Connelly, and director Ang Lee combined into one.