- Erreurs faites par les personnages (éventuellement des erreurs délibérées par les cinéastes): In one scene, the TV news announcer states that Hancock has been taken to "Los Angeles General Hospital." In the following scene, an exterior shot of the hospital reveals the name "Mercy General Hospital".
- Continuité: When Hancock first arrives at Ray's house, the amount of spaghetti and meatballs in the bowl changes between shots.
- Continuité: When the SUV is fleeing the police, it turns a corner and crashes into the side of a car. In the next scene, the side of the SUV has no damage.
- Révélant des erreurs: When Hancock picks up the police cruiser to protect the downed female officer, the car has no transmission or prop-shaft.
- Continuité: During the car chase, Hancock breaks a bottle behind a suspect's car. In next shot, he holds a different looking, obviously fake broken bottle.
- Continuité: When Ray is waiting in traffic on the train tracks, he is talking on a cell phone, holding it up to his left ear. He ends the conversation. In a later long shot, the phone is still at his left ear.
- Continuité: After impaling the SUV on the tower, Hancock is drinking in a bar. In close-ups he holds a bottle of beer in his left hand. In long shots, the bottle is in his right hand.
- Continuité: Hancock talks to Mary while eating a banana, which changes from eaten to uneaten, and back again.
- Continuité: When Mary throws Hancock out of the house, he crashes into a gold Dodge Intrepid. When we see the aftermath the next morning, the Intrepid is fine, but the cars on the other side of the street are damaged.
- Considéré à tort comme goofs: In the latter part of the movie, Hancock talks to Mary about the way they kissed. They never kissed in the theatrical cut; because Mary threw him through the wall before their lips touched. The kiss is restored in the DVD version.
- Equipe ou équipement visible: Monitors are reflected in Hancock's glasses throughout the movie.
- Erreurs faites par les personnages (éventuellement des erreurs délibérées par les cinéastes): In the YouTube video of the whale, Ray calls 'Walter' a gray whale. Walter is clearly a humpback.
- Continuité: When Hancock throws Ray's car into the other cars and stops the train, Ray's windshield cracks. When Hancock drags the car into the driveway a few moments later, the windshield is as good as new.
- Considéré à tort comme goofs: After Ray meets Hancock for the first time, when the camera follows Ray and Mary's dog across the bedroom, what appears to be a crew member pushing the dog from behind the dresser is actually the shadow of the dog's tail on the wall. If you look closely, the dog is watching something/someone behind the bed for a signal.
- Anachronismes: The date on Hancock's 1931 Frankenstein movie ticket reads 21 June 1931. Universal's Frankenstein was released November 4 1931.
- Continuité: When Ray is about to be hit by the train, long shots show his car on the tracks. Shots from inside the car show that the car isn't on the tracks.
- Erreurs factuelles: To throw Michel high up into the air, Hancock would have to use so much force that the boy would have suffered massive, lethal internal injuries. This is also true for when Hancock catches Michel, he would have certainly not survived.
- Continuité: In the Youtube scene, the full screen viewings of the Youtube clip show the Youtube logo superimposed upon the bottom right of the clip. In the wide shot, it is on the left.
- Révélant des erreurs: When Hancock and Ray are talking through the glass in prison, the cutout that Hancock is about to make in the glass is clearly visible, especially running across Ray's right cheek.
- Continuité: When Mary takes the fork from Hancock to straighten it up, the fork is straight a fraction of a second before she moves her hand over it.
- Continuité: Ray picks up a tri-colored towel, then opens a jar with a green and gold towel.
- Erreurs factuelles: The locomotive engineer would have been seriously injured, if not killed when Hancock stopped the train, due to the impact speed. After the train has stopped, the engineer is unhurt.
- Considéré à tort comme goofs: When Hancock throws Michel in the air, then catches him, the car in the background, which is later hit by the refrigerator, is already damaged. Only the windows are broken, which could have been caused by flying pieces of asphalt or the concussion of Hancock's landing.
- Audio/Video non synchronisé: When Hancock is sleeping at the bus stop, a whiskey bottle rolls away from him. It's plastic, but makes the sound of glass rolling on concrete.
- Continuité: When Ray is on the train tracks, his seat belt is stuck. After Hancock flips the car, Ray is shown laying on the inside of the roof; with the seat belt undone. A seat belt is harder to unlatch when it has tension on it; as would be the case when hanging upside-down.
- Continuité: When the train comes to a halt, the freight car behind the locomotive is a gondola, but when Hancock walks around the locomotive and sees the rest of the train piling up behind it, the gondola has changed to a boxcar.
- Continuité: When Ray is drunk and laying on the bed talking to Hancock, he asks Hancock to help him up. In the first shot, they grab each others forearms to for leverage. In the following shot, they are using their hands.
- Erreurs dans la géographie: Ray holds a cup from Dunkin' Donuts. The film takes place in Los Angeles. There are no Dunkin' Donuts in the Los Angeles, California area.
- Erreurs factuelles: In the final scene there are several factual errors: a flash explosion would not trigger a fire sprinkler to go off; if it had, it wouldn't trigger every sprinkler in the hallway. Finally, modern sprinkler systems are connected to the building's fire alarm, which would have also sounded.
- Considéré à tort comme goofs: When Hancock stabs Mary with a knife, it bends. But Mary has pierced ears. However, she could have gotten them pierced when she and Hancock were together, and therefore mortal, in the past.
- Considéré à tort comme goofs: Hancock says the needle bent when the nurse tried to give him a shot at the hospital 80 years ago, yet his ears are clearly pierced. However, Hancock most likely got his piercings during a time where he and Mary were together (and therefore mortal).
- Continuité: In the film, Mary flies to Hancock's trailer. After Mary gets out of Hancock's trailer, you see top of her SUV, and Mary begins to get into it. In the next shot, they are standing in front of each other and there's no car, as it wasn't there when Mary came. (In the DVD version, Mary is seen driving to Hancock's trailer.)
- Considéré à tort comme goofs: Even though both Hancock and Mary take damage at various points throughout the movie, their clothes seem to be fine. It is a common thing, especially in comics and cartoon, that superheroes protective abilities encompass clothing and other items in extreme close proximity to themselves (aura effect). Since both of them are invulnerable and this is a superhero movie, it would be assumed that the directors would apply this effect in the movie to prevent full nudity.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Continuité: SPOILER: When Mary is in the hospital bed, just after being shot, the blood stain on her shirt changes between shots.
- Révélant des erreurs: SPOILER: Near the end of the movie, when Mary is 'dying', the monitor has a label at the top of the screen that says 'leads off,' meaning the monitor isn't hooked up.
- Considéré à tort comme goofs: SPOILER: According to the movie's premise, Hancock and Mary become mortal and weak when they are close to each other. However, the weakness happens over time as they spend more time together. That explains why Hancock was unfazed when Mary threw him through the wall, and why Mary was unharmed when Hancock attempted to stab her in the kitchen.
- Considéré à tort comme goofs: SPOILER: When we find out that Mary has powers, she says she and Hancock are brother and sister. They are regarded as husband and wife for the rest of the movie. This is due to the movie hinting at Hancock and Mary being Zues and Hera. In Greek mythology, Zues and Hera were both husband and wife, and brother and sister.
- Considéré à tort comme goofs: SPOILER: In the unrated version, Hancock demonstrates the problem with sex because of his strength. That version implies that Hancock cannot have normal sex with ordinary women because of the force of his ejaculation. Mary wouldn't have that problem.
- Considéré à tort comme goofs: SPOILER: When Mary regained consciousness as Hancock distanced himself, she would have regained her gag reflex as well, and would have choked on an endotracheal tube being used to maintain her airway. However, the device in her mouth was a much shorter tube called a Guedel or laryngeal airway, which can be used in semi-conscious people to prevent tongue-swallowing.
- Révélant des erreurs: SPOILER: When Hancock is dying, the paramedic shines a flashlight in Hancock's eyes. The assumption is that Hancock is unconscious, so his pupils should have been dilated. However, Hancock's pupils are fully contracted.
- Erreurs factuelles: SPOILER: Near the end of the movie, as Hancock and the villains are slugging it out in the hospital, one of the bad guys picks up a medical gas cylinder and proceeds to use it as a weapon, striking Hancock several times. At one point the cylinder explodes, causing a large fireball as the two combatants crash through a wall. The problem here is with the type of cylinder that is used. Internationally, all compressed gasses are denoted by the colors of the container, in the United States, for example: green = oxygen, red = acetylene, and light blue = nitrogen, etc. The cylinder that is being used for the fight scene is what looks to be either silver or light gray - which would indicate carbon dioxide. While it is incredibly useful as a medical gas, and would certainly explode with considerable force should the container be breached, it is also non-flammable and therefore would not produce the firestorm as seen in the movie. In fact, the carbon dioxide would displace the oxygen in the vicinity and would act to suppress any flames present.
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