Continuity: In the first few scenes of the movie, General Ross has the gold striping on his shoulder epaulet rank on the inside of his shoulder, which is the wrong position. Later in the movie, the rank is switched back to proper military regulation.
Audio/visual unsynchronized: When Bruce is delivering the pizza, he rides a bicycle through the campus. As he weaves through the crowd we hear a bicycle bell. There is no bell on the bike's handle bars.
Factual errors: As Dr. Betty Ross emerges from the side of the crashed helicopter on the roof top, she is seen grabbing onto the barrel of the Gattling Gun. This would be impossible as the temperature of the barrels would to be too hot to touch after being just fired prior to the helicopter crashing.
Continuity: During the scene where Bruce is talking with the man who works at the Pizza place, Bruce's hair in the front alters in between shots, in one shot, his hair is against his forehead, in the next shot, it's combed to the side, in the next shot, it's against his forehead again.
Factual errors: UH-1 Huey helicopter seen early in the film has an "N" registration number. Only US civilian aircraft have "N" registration numbers, US Military aircraft do not.
Factual errors: When the box of drinks containing the contaminated bottle is packaged, it has 'Brasil / U.S.A' printed on the side to show its destination. However, while Brasil is depicted with its Portuguese spelling, the acronym for the United States of America in Portuguese is 'E.U.A.' for Estados Unidos da América, not 'U.S.A.'
Revealing mistakes: Major Blonsky is identified as being "on loan" from the British Army. He appears however to be wearing the rank and insignia of a US Army CAPTAIN who is Special Operations Qualified.
Continuity: In the scene where Bruce explains to Betty what can and can't be tracked, the wallet goes from closed to open in one shot. And the $20 bill goes from being neatly tucked in her wallet to crumpled on the bed.
Factual errors: In the opening scenes, the name plate on his desk reads 'General Ross'. General is a four star rank. Ross is a Lt. General, a three star rank. The nameplate should read 'Lt. Gen. Ross'.
Continuity: During the final battle scene, Hulk smashes apart a police car to make gauntlets. When he smashes the to pieces together, his pants are clearly above his knee, almost like shorts. Yet when he attacks the Abomination in the next shot, his pants are at his lower legs again.
Continuity: During the Brazil chase scene, the time of day appears to change from night to day and back to night again. When the soldiers first enter Bruce's home, it is night and Bruce is thought to be sleeping. However, when Bruce is running through the city, it is clearly daylight, only to turn into night again as he enters the factory.
Revealing mistakes: The Portuguese spoken by some actors acting as Brazilian characters (like Tough Guy Leader) is heavily broken, with ridiculous accents. The Portuguese words and dialog are clearly phonetically memorized. Obviously only Brazilian actors Débora Nascimento and Rickson Gracie speak a real Portuguese.