When Laurie and David drive into the water Laurie gets soaked. When the Hulk pulls the vehicle out she is completely dry.
Around the 45min mark when the 'Hulk' has pulled the car out of the water, he then pulls the door off the car. As the camera tracks back you can see the 'Hulk' is wearing green slip on shoes.
When the Hulk snaps the seat belt to release Laurie from the car, the seats are red. In all other shots the seats are blue.
When the Hulk breaks out of the night club and smashes the wall the inside walls are red, from the outside scene it is obviously stock footage previously used because the background is different.
After David's experiment goes wrong, the playback of his recording does not match what he originally said.