Revealing mistake: The scene of rioting in the UK features a load of police officers running through a crowd. All the officers shown are wearing black tunics and custodian helmets worn with chinstraps. This is obviously old stock footage from a protest in the 80's or early 90's as nowadays, (and especially in 2012) the tunic has not been worn as general wear for well over 15 years, and Brit cops are now better equipped for protests with body armour, NATO helmets, flame retardant overalls, etc.
Revealing mistake: Just as Jacob enters Bella's room through the window, a stunt prop - white band on his right wrist - is briefly visible.
Suggested correction: There is nothing on his hand if you watch frame by frame.
Revealing mistake: When John is stuck in traffic and he walks up to the other man asking if anyone was hurt, the guy looks behind John's shoulder as if the plane is coming right behind him. Then John turns around and looks right behind him as well. But the camera then pans all the way to the side to see the plane coming in before it crashes - they were looking in the wrong place.
Revealing mistake: When Barnes and Marcus Wright are helping John Connor back to the chopper and when Barnes gets in the helicopter, he's revealed to be a stand in. It's in plain sight, at the right side of the screen. (01:41:20)
Revealing mistake: While Cath is trapped on the other side of the fallen boulders, Dan tries to move some of the rocks to get her out. You can see one of the rocks by his feet move as if it is made out of foam. (00:34:25)
Revealing mistake: At the Smithsonian Air and Space Museum, there is a triangular enclosure around Jetfire that amusingly just fades away and vanishes as Jetfire transforms. (01:23:05)
Revealing mistake: In the hospital scene when the nurse is filling the tub for the patient in the room above the cowboy's, he leaves the water on. When the water starts to come out of the tub it is coming out many times faster than it is going in.
Revealing mistake: When the old couple who give Wolverine clothes are first driving towards their house, there is an aerial shot of them driving over a bridge. This is supposed to be set in Canada (drive on the right) but it was filmed in New Zealand (drive on the left). They are driving on the right but the arrow on the road is on the left side.
Revealing mistake: After Garber shoots Ryder, he is told by the approaching policemen to "drop your weapon". At which point the camera pans to a shot behind Garber where he is holding the gun in his right hand and proceeds to drop it. Watch the bottom of the screen and you will see Garber catch the falling gun with his left hand.
Revealing mistake: Axel's badge says deputy sheriff. He is THE sheriff. Not a deputy.
Revealing mistake: It's an obvious rubber dummy when Chavez cuts off Juarez's leg. (00:43:30 - 00:44:05)
Revealing mistake: During the final confrontation in Veidt's lair, you see the actor Billy Crudup in his SFX suit reflected in Nite Owl's goggles, not the image of Dr. Manhattan.
Revealing mistake: The film is set in 1891. After Holmes escapes from Parliament, Thomas Thornycroft's statue of Boadicea on the Thames Embankment next to Westminster Bridge can be seen, even though it was not completed until 1905. (01:35:45)
Revealing mistake: When Langdon and Victoria walk towards the Pantheon, the first two angles show them walking alone with some stunt-women behind. But in the third angle, a couple of seconds later, a huge line of people appears, lining perfectly in the back, watching the camera. Obviously a group of real tourists standing behind a security line watching the shooting.
Revealing mistake: When William is running at the end, there is already a blood trail on the floor. Clearly from another take. (01:15:10)
Revealing mistake: During the ophthalmologist scene, when they zoom into the view of Casey's eye you can see the ring of the contact lens used to create the pigment change special effect.
Revealing mistake: During the four-year flashback scene in East Africa, after the building is bombed, two helicopters fly to the right of the building. However, because they are CGI, the telltale whirl (or any movement) the blades should have made in the smoke isn't there. (00:50:10)
Revealing mistake: When Christine is looking at the obituaries in the café, one of them is for Fredericka S. Freund. However, once you get past the first paragraph the obituary seems to be for Dr. Mary Allen Engle (nee English). Also, they forgot to put "Dr." before Freund's name. It may not be a coincidence that the Property Master for the movie is named Ellen Freund. (01:25:00)
Revealing mistake: When Dr. Heiter takes Katsuro from his car, you see Heiter drag him out of the back seat. He then proceeds to lift Katsuro. If you watch Katsuro's hand, you'll see he "helps" Heiter by pushing himself on the door-frame of the car (you see his hand tense as he pushes himself up).
Revealing mistake: When Vang and Chev are running and about to jump the fence into the power station, look in the fence and you can see the handy foot holds that the actors use to go over the fence.