When Banner has his first Hulk Out trying to save Jack Magee from going over the cliff, there is a quick cut of actor Jack Colvin's hand holding onto a branch. (Jack is supposedly unconscious, and you can see his dark hair and hand through his jacket sleeve holding the branch.)
The jeans the hulk is wearing after his first hulk out are torn at the bottom. When "John" turns back to normal his bell bottom jeans are in one piece.
The hard hats used by the fire fighters are totally different to the hard hats used by the fire fighters used in the stock images of the fire.
Shadow of crewmember visible on Banner's back during first change scene.
When "John Doe" and Jack McGee are talking about gangrene, David calls Jack "John".