During the first hulk-out, as always, the metamorphosis tears through David's shoes, and the Creature is barefoot. Yet when he transforms back into David in the alley, David is wearing shoes, as though he'd never lost them.
Some streets have snow and others do not, due to filming on location in New York and on the backlot in California.
When the Hulk is running through Times Square, you can tell that he's wearing sneakers that have been colored green instead of actually being barefoot. (You can even see the regular colored, non-green soles of the sneakers in a few spots.)
As the Hulk runs through the streets of New York, there is a close up shot of Lou Ferrigno, who is playing the Hulk, without the Hulk contact lenses in his eyes.
When the Hulk runs throughout Times Square, it is obvious that the people are almost oblivious to him. The screams are dubbed in over people carrying on their business, as when the Hulk runs in front of a crowd of people crossing the street.
When David begins changing into the Hulk in the back of the cab; the tape line on the prosthetic "hulk" forehead is clearly visible.
When Norman and uncle Leo drive off in their car, the camera-crew is reflected as the car drives by.