Continuity mistake: When Doc Samson throws Hulk through the train station, it is a wooden building. When Hulk crashes out of the back side, it is now a brick building.
Helping Hands, Iron Fist - S1-E4
Audio problem: When the S.H.I.E.L.D. helicopters land at Stark Industries, you can hear their rotors slow to a stop, but the animation still shows them to still be spinning.
Audio problem: When General Ross interrupts Gabe Jones by saying "Will be under my exclusive command," his mouth is not moving for the word "exclusive."
Helping Hands, Iron Fist - S1-E4
Audio problem: When Gabe Jones has his back to the camera and is telling Ross where on the map that Hulk was going, his jaw is not moving at all.
Audio problem: When General Ross is saying to Major Talbot "If Nick Fury thinks he can just..." his mouth isn't moving.
Continuity mistake: When Hulk jumps up onto Talbot's helicopter, it changes color from an army green to blue.
Audio problem: When Hulk is saying "Hulk smash! Hulk bash!", his teeth are clenched.
The Return of the Beast: Part 2 - S1-E2
Continuity mistake: When the Leader is preparing to force Banner to transform into the Hulk, he shoots Gargoyle in the left shoulder with a blaster for being insolent, which leaves a hole in the corresponding area of his clothing. Moments later, the hole has disappeared.
The Return of the Beast: Part 1 - S1-E1
Continuity mistake: When General Ross is warning Banner that he is not bulletproof, an armed guard is flanked on either side of Banner. When the shot changes, the guard on Banner's left had suddenly moved several feet away.
The Return of the Beast: Part 1 - S1-E1
Continuity mistake: When Rick is telling his boss that he needs to leave work to help out a friend in a jam, he is standing next to the payphone, and when the shot changes, he is already several feet away sitting on his motorcycle and putting his helmet on.
The Return of the Beast: Part 1 - S1-E1
Audio problem: When Rick answers the payphone, his mouth isn't moving when he says "Ed's Garage."
The Return of the Beast: Part 1 - S1-E1
Continuity mistake: When the Hulk is trapped inside the containment unit and Betty calms him down, once he has reverted back to Bruce Banner, his hair is shown being blonde instead of brown.
The Return of the Beast: Part 1 - S1-E1
Audio problem: When the soldier is telling Talbot what Banner is doing with the power station, the soldier's mouth and jaw areas are not moving when his back is towards the camera.
The Return of the Beast: Part 1 - S1-E1
Continuity mistake: When General Ross is talking to Betty about the danger the Hulk presents to the world, the distance between them differs depending on the shot. One shot shows them standing close enough to hug each other, the next shot shows them instantly at arms' length apart.
Other mistake: This show is in the same continuity as the Fantastic Four series from around the same time. However, in Fantastic Four, Dr. Doom has a German accent, and in this episode, he has a slight British accent.
And the Wind Cries... Wendigo - S1-E10
Other mistake: When General Ross is telling Hulk he will take care of Betty, he tells the Hulk he needs him to take care of the Wendigo. At this point in the episode, Ross doesn't know that the Wendigo is the creature that they are hunting.
Other mistake: When Bruce Banner is sitting on the dock and recording his thoughts on a tape recorder, you can see that while his reflection's mouth is moving, his actual jaw is not.
Factual error: The opening shot of the Statue of Liberty shows the statue's left arm to be raised too high. The real statue has its left arm close to its midsection, whereas the statue depicted here has its arm nearly raised to shoulder level. (00:00:01)
Factual error: When Hulk throws the Humvee at the helicopter, the pilot bails just before it explodes and manages to deploy his parachute. The helicopter was hovering roughly 30 feet above some buildings. That's not nearly enough distance for the pilot to have deployed his parachute before he fell onto the roof of one of the buildings.
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.