After the Hulk first confronts the Screaming Vultures and they leave, Rick Jones' shirt sleeves are colored beige like his waistcoat by mistake in two shots.
As Claw chases Banner on a motorcycle, his yellow beard turns brown and then yellow again.
When the Hulk rescues an unconscious Betty from the Psychic Nullifier, her head is still covered by the dome in one shot, but it has disappeared in the next.
When the Screaming Vultures arrive at the carnival, in the overhead shot, the two bikers on the right appear to drive over a the edge of a snack stand instead of behind it.
When the Hulk escapes from the Psychic Nullifier, the inside of the dome that was covering his head is not colored in, revealing the chair in the background.
The female biker has a laser gun that emerges between her handlebars and shoots backwards. It should hit her in the face but somehow manages to aim behind her.
After the Leader puts on the Psychic Brain Blaster, he blinks his eyes in close up. But instead of animating eyelids, his eyes just turn the same color green as his skin for a few frames.