Continuity mistake: When Hulk says "Thing? Hulk enemy," he raises his right fist while standing face-front towards She-Hulk. When the shot changes, his fist is immediately out of shot and he is now standing shoulder to shoulder with She-Hulk.
Continuity mistake: When Bruce and She-Hulk are hitchhiking, the sign for New York behind them changes size and lettering. When it is first shown, it is significantly taller than both of them with the lettering reading "NeW York" (sic) in a thin and long font type. When the shot changes, the sign is much shorter and the lettering now reads as "NEW York" in a more block-lettering style.
Man to Man, Beast to Beast - S1-E6
Continuity mistake: When Dr. Langkowski presses the play button on Banner's tape recorder, he is pressing on the right side of it. When the shot changes, the buttons are now on the left side of the recorder.
Continuity mistake: When Ghost Rider crashes his motorcycle out of the building with Talbot in tow, he is holding Talbot around his midsection. When the shot changes to them in free fall, he is gripping Talbot by his collar. When they land on the street, he is back to holding him around his midsection.
Continuity mistake: When the helicopter is put in hover position for Talbot to shoot Hulk with the tranquilizer weapon, you can see that the pilot seat is unoccupied. When the shot changes, Talbot is suddenly in the seat.
Continuity mistake: When Ghost Rider tracks down the Hulk at the salvage yard, he pulls his motorcycle right up to within a couple feet of the fence. When Rick Jones pulls up perpendicular to Ghost Rider, one shot over Ghost Rider's shoulder shows pavement behind Rick instead of a fence. A couple of shots later, the fence is directly behind Rick. Another couple of shots later, Ghost Rider is shown from the back saying "An innocent victim shall suffer" and he is suddenly facing a group of buildings instead of the salvage yard. All remaining shots in the scene place Rick and Ghost Rider back by the fence.
Continuity mistake: When Bruce Banner is in the soup kitchen, he is seated in a chair next to the one at the end of the table. In the shot just before the explosion, he is getting out of his chair, which is now the one at the very end of the table.
Helping Hands, Iron Fist - S1-E4
Continuity mistake: Early in the Hulk's fight with Iron Man, he punches Iron Man onto the hood of a red car and then throws a blue car at him. Iron Man disappears from the screen as soon as the blue car hits the red car, and then can be seen either back on the hood, or instantly inside the car. If he is still on the hood, then he disappears from the screen once again when Hulk throws the car.
Helping Hands, Iron Fist - S1-E4
Continuity mistake: When Hulk punches Iron Man into the bus, Iron Man is shown landing through the roof in the middle third of the bus on the driver's side. When the shot changes to Iron Man inside the bus, the hole in the roof is now shown to be down the center of the bus and closer to the front.
Continuity mistake: When the Hulk lands in the streets of Chicago after his battle with Ghost Rider, he is in the middle of the street. When the shot changes, he is suddenly next to the curb and a mailbox.
Man to Man, Beast to Beast - S1-E6
Continuity mistake: When Dr. Langkowski climbs into the large test tube to run the experiment on himself and Banner, he uses a hatch wheel to seal his tube closed. When the shot changes, the wheel has disappeared.
Man to Man, Beast to Beast - S1-E6
Continuity mistake: When Taylor discovers Sasquatch's footprints in the snow, they have no toe prints. When Taylor's father finds the same footprints, they now have toe prints.
Man to Man, Beast to Beast - S1-E6
Continuity mistake: When Dr. Langkowski is talking about solving the mystery of gamma mutation in humans, a couple pens appear in his shirt pocket.
Helping Hands, Iron Fist - S1-E4
Continuity mistake: After Rick Jones finds Bruce Banner among the overpass wreckage, Bruce starts transforming into the Hulk and grabs some gray rubble, which immediately turns the same color as his flesh.
Helping Hands, Iron Fist - S1-E4
Continuity mistake: When Rick Jones is hanging on to the containment unit that the Hulk is trapped inside, at one point the Iron Man gauntlet that he borrowed switches from his right hand to his left.
Answer: The Hulk is a giant brute who smashes everything in his path when he is angry. In Ang Lee's "Hulk," General Ross, played by Sam Elliot, explains it to his daughter.