Corrected entry: Why on earth would the prisoners gang up on Hancock in the prison yard and threaten him with violence? They know who he is, and they know he is an invulnerable superhero and could take everyone of them down painfully with one hand. Even those who don't have personal experience of him would know from the media reports that he cannot be beaten by a human being. Don't tell me they think he is a reformed character - they continue attacking him after he has violently punished two of them for merely threatening him - and they hurt themselves hitting him even if he just stood still and took it.
Corrected entry: John Hancock and Mary Embrey are both endowed with super powers, such as flight, healing ability, and invulnerability. The latter is demonstrated in that Hancock was unable to receive an IV when he was checked into the hospital (in the 1930s) as the needle simply broke off. How then is Mary able to have pierced ears? A needle would have broken, and even then, the wound would heal rapidly.
Corrected entry: Throughout the film stationary, unoccupied cars are hit with debris, other cars, fridges, superheroes, and are turned upside down, knocked around or thrown sideways. Not one single car alarm goes off.
Corrected entry: When Embrey is talking with Hancock in jail via the telephone intercom, they're facing each other through wire mesh reinforced glass. Hancock uses his fingernail to score a circle in the glass and then taps it out as a perfect circle. This type of glass would not tap out with scoring, since there's a wire mesh bonded between two layers of glass. At most he would've dislodged the interior pane and shattered the exterior pane.
Corrected entry: At the start when Hancock is stopping the car on the bridge, he rams his feet through the car floor to stop it. As the wide shot begins to show the car stopping, the back wheels of the car have locked up as though the handbrake has been applied, if Hancock was stopping the car this way there would be no wheel lock-up as the car is being stopped this way.
Corrected entry: In the scene where Mary Embrey goes to Hancock's trailer to tell him about their past, Hancock says something to the effect of "sisters don't kiss their brothers the way you kissed me in the kitchen last night." In fact, the night before, they never kiss, they just come real close to kissing before she throws him through the wall.
Corrected entry: The locomotive in the train wreck was a low-powered switching engine. Dozens and dozens of rail cars kept piling up, yet that engine would not have been powerful enough to pull such a long train in the first place.
Corrected entry: Spoiler Alert: When the 'superwoman' tells Hancock that they were built in pairs so that they could live together and die together, it completely contradicts what happens at the end of the film. As she is is lying dead on the hospital bed, Hancock uses the last of his strength to move far away from her, thus causing her to live again and both of them start becoming immortal once more. If this is the case, then when one of their kind dies, as long as the one who is alive is far enough, the being that died will come back to life and both will become immortal again.
Corrected entry: (SPOILER ALERT) When Hancock returns in the morning after he has been tossed out of the house by Mary, he tries to stab her with a fork only to see it bend when she is stabbed. But later you find out that when these two are close to each other, their powers weaken and they can be killed and shot, just like normal people.
Corrected entry: After Hancock gets called out of jail, the officer tells him to rescue the cop that's down. The criminals pull out the rocket launcher and it pans over to a view of the officer when she is near the tire of the police car. But when Hancock gets to her, she's moved to the middle of the car somehow.
Corrected entry: Hancock meets up with the super powered woman, who explains to him that he will start losing his powers the longer he's near by. Problem is, when he gets shot in the liquor store, he's nowhere near her. Even if he had just come directly from their home it wouldn't matter, because later in the movie it's established that Hancock regains his powers when he's only a few feet away from her in a very short time. (When he's leaps out the window, she miraculously awakens.) And he'd only been out of her sight for a few moments before he's up and flying again.
Corrected entry: Hancock is all bulletproof, of course. But that shouldn't make his new, black superhero suit prepared by his PR manager bulletproof, too. When he is going into the war-zone in the bank robbery sequence, you can see the bullets bouncing off his suit, making no hole whatsoever. However, we know that his superpowers do not extend to his clothes, evidenced by his sunglasses being broken by bullets, and all his clothes burnt off due to a fire.
Corrected entry: After Hancock is shot and taken to the hospital, the press and police are swarming the place, trying to get a statement from the husband as he enters. With people everywhere and all eyes on Hancock, how did a group of heavily armed men all dressed in black casually walk in and start attacking? We're led to assume they snuck in, since no weapons are shown when we see the henchmen in the hallway, and the leader (Red) rides up the same elevator with the husband and son.
Corrected entry: (Spoiler Alert) Hancock is shot after losing his powers because he's been spending too much time around the other super heroine. And she's aware of this. She knows for a fact he's losing his powers, and she's well aware that this has happened several times before, which is why she left him in the first place. So what on earth possesses her to walk into the hospital and up to Hancock to tell him that face to face? She could have called the hospital, or given the message to her son or husband, since she knows full well that Hancock becomes vulnerable when she's around and she knows he's injured. She left him in the first place so he could heal up, so why would she choose to visit him now instead of at least waiting a few hours? (Hell, she left him alone for years, a few hours won't kill her.)
Corrected entry: If Hancock and Mary are connected (as established out of nowhere through the lengthy fight scene towards the end of the movie in the hospital, where Hancock takes the blows, and the damage appears on Mary's body), how does Mary flatline, and Hancock get up and leave in order to save her? Not to mention that, considering the focus they made on the 'connection' since Mary was on the threshold of death, a leap out a window should have left Hancock splattered all over the ground.