During their first scene together, Bruce and Betty say the presentation they have to make to the review board is on Tuesday. However, after the failed experiment, Bruce says they're going to the review board on Monday.
(at around 1h 38 mins) There's a rock behind the Hulk on the cliffside as the Commanche choppers appear, but the rock is gone in subsequent shots.
(at around 1h 19 mins) Betty looks at Bruce as he opens the door to the room his parents argued in, but she's looking into the room in the next shot.
(at around 1h 48 mins) Betty's hair blows in the wind as she descends the stairs toward the Hulk, but her hair doesn't move much when the camera is behind her.
(at around 58 mins) After telling Talbot he's making him angry, Bruce turns to him, and his mouth opens like he's about to finish the iconic line, but the shot suddenly cuts to Talbot, who looks like he's reacting to the deleted second line.
When the Hulk sees the mutant dogs approaching, he picks Betty up and puts her in her car for safety, but his hands are too large to operate a car door latch. In the novelization, he shoves Betty against the vehicle so she can open the door and thrust herself inside before he slams it shut. Also, Betty must've forgotten to lock her car since the Hulk easily opens the door without damaging the handle.
David Banner extracts the bio-luminescence properties from jellyfish, implied to be why the Hulk is green. But bio-luminescence isn't about having green skin, it's the ability to emit light from your skin, and the Hulk's skin doesn't glow, not even in the dark, and all he has is skin with green pigment.
(at around 1h 33 mins) The Hulk throws a tank roughly half a mile away into a dune; moments later, a soldier emerges from it as if nothing happened. The impact would've been as strong as a plane crash, so all the soldiers in the tank should be gravely injured or dead.
(at around 1h 42 mins) After fighting the tanks and helicopters, the Hulk heads for home by leaping across the countryside. He lands with one foot on the road and the other on the grass near a road sign marked San Francisco 61 [miles] Berkeley 65. There is significant damage to the tarmac road but virtually none to the earth at the side of the road.
When the Hulk fights with the helicopters, one loses control while avoiding a thrown object and comes within a few feet of colliding with another chopper. They fly through each other's rotor disks, but neither comes to harm.
(at around 1h 18 mins) When the security guard enters the lab to confront David Banner, behind him are assorted props that are supposed to be various lab equipment, including several electric guitar amplifiers.
(at around 1h 2 mins) While the Hulk puts his hand around Betty, the sides of her coat flare out, even as he holds her, a telltale sign that Jennifer Connelly hung from wires, which seemingly weren't touched up well in post-production.
(at around 1h 2 mins) As the Hulk puts Betty in her car, she goes through the Hulk's hand for a few frames. It's better seen by increasing the brightness/lowering the gamma setting.
(at around 1h 1 min) Betty's arm partially goes into the Hulk's hand while he carries her to her car. While the Hulk sets Betty down on the car roof, her arms are raised, so his hands should be beneath them. Only his left hand is, while the right one goes around, not holding Betty securely.
(at around 1h 47 mins) The Hulk stands in the water gushing from the smashed hydrant. His hair should be sopping wet, but it's merely damp instead.
(at around 1h 30 mins) The keyboard the female soldiers uses is unplugged. The plug is on the floor beside the keyboard before General Ross orders her to turn of the lights, and lead the Hulk outside the base.
The film depicts several California National Guard troops as armed with M16A1 rifles (distinguished by their smooth, triangular forward hand-guards and three-pronged flash suppressor). The National Guard phased out the M16A1 in the 1980s, replacing it with the upgraded M16A2 (ribbed, rounded forward hand-guards, and an enclosed "birdcage" flash suppressor).
(at around 1h 29 mins) When Talbot tells an Atheon troop to clear his weapon, his mouth doesn't move with his dialogue. His line comes a second sooner than intended; he was probably supposed to say it after turning his head away from the screen.
(at around 17 mins) After Talbots calls Betty, the two shots are out of sync, so she says his name a second sooner in the left one than in the right one.
(at around 1h 22 mins) When briefly visible in the shot, Betty's mouth doesn't seem to move when she says, "Really?"
(at around 1h 3 mins) When Lily bites Hulk's groin, Hulk's mouth opens at the moment of contact, but he doesn't start grunting in pain until the scene cuts to his reaction.
(at around 47 mins) After Betty looks at her notebook while driving to David's place, it cuts to the house with a truck on the right. After Betty passes the truck, something that looks like a piece of filming equipment is briefly visible in the bottom-right corner.
How does the Hulk know to find Betty at her cabin when Bruce didn't know she'd be there instead of her house? According to the illustrated script and Peter David's novelization, the Hulk pulls Betty's scent from the air. The junior novelization implies the Hulk may also be acting on Bruce's memory of the cabin. Bruce would surmise Betty would be there instead of home since her father would place protection there out of worry for her safety, and Betty would want to get away from it.
How does the Hulk reach Betty first despite the Hulk-dogs having a big head start? Peter David's novelization has David siccing the dogs on Betty after calling Bruce rather than before.
Why doesn't Betty return home after questioning David Banner? In Peter David's novelization and a deleted scene, Betty does return to find MPs confiscating everything connected to the lab on her father's orders, and one parked across the street for her protection. Betty eludes the MP while driving to the cabin in the novelization.
How does Talbot expect to get a sample of the Hulk with a mere DNA extraction drill, given that the Hulk's skin is stronger than Kevlar, even if he tried through the Hulk's eye? Talbot pierces the Hulk's neck with a handheld laser drill and chunks of the Hulk's skin tear off in the illustrated screenplay and Peter David novelization.
(at around 12 mins) Betty and Bruce discuss a presentation they're due to make to the review board; they mention it again after the failed experiment. The review board presentation sounds like an important detail, but it ultimately amounts to nothing. A deleted scene shows the presentation, where Betty and Bruce explain the nanomed technology.