Continuity mistake: When Joseph Gordon-Levitt is shot by Emily Blunt with rock salt, he is hit in the right shoulder. In the next scene he is having his left shoulder treated. The porch swing and chair are now on opposite sides from other scenes too - the whole shot is flipped.
Continuity mistake: When Peter falls through the roof and lands in the wrestling ring, the planks on his body suddenly disappear.
Character mistake: As Bruce Wayne is researching the jewel thief, the word "Heist" is spelled "Hiest" in a newspaper headline. (00:15:45)
Continuity mistake: When Dex is being interviewed in the park, he is holding the basket of baby kittens that he rescued. He is never shown handing the basket to anybody else, but just seconds later, as everyone leaves and Dan arrives in the scene, the basket of baby kittens has suddenly vanished. (00:04:30)
Continuity mistake: They are shown boarding a Boeing 767, which is a twin engine plane. We're then shown a four engine 747 flying off to Manila.
Continuity mistake: When Mikey wakes up from being shot, Sunny has on a pair of green/black Mechanix gloves.When they get in the SWCC boats, and is talking to Rosland Sanchez, his gloves are black/white Mechanix gloves.
Factual error: When Maya and team first enter the hangar at Area 51 to see the helicopters, mechanics are working on them with socket wrenches. However, when they use the socket wrenches, they turn them one way to make the ratchet sound, then lift the wrenches up off the bolts to put them back in their original position, and do it again. In fact, the way they are holding the wrenches with both hands indicates there might be no bolt there at all. In other words, they are doing absolutely nothing...just making a ratchet noise.
Continuity mistake: The homeless beggar at the entrance of Peach Trees gets splattered by the blast doors closing, creating a pool of blood on the ground. When they open again at the end of the film there is no blood or body.
Revealing mistake: Right at the end of the fight between Selene and the Uber-Lycan in the vampire coven, the Uber-Lycan throws Selene into some wooden panels, knocking her unconscious. As she travels through the air you can tell that she is suspended by wires; she travels far too slowly towards the wooden panels for someone who was just thrown. (00:48:35)
Continuity mistake: When the stewardess is at FDR's door when the camera is facing her her hair is up, but when then camera goes behind her the hair is down and flowing. (01:07:50 - 01:08:55)
Revealing mistake: When Snow White rides the white horse bareback to the dark wood. In the last few frames as the horse gets trapped in the mud you can see a very thin set of reins attached to the horse's head.
Plot hole: Hock sneaks a gun into the prisoner interrogation area because he is told that guns are not allowed there. If the prison was so strict about keeping guns out of that area then they would surely have metal detectors to prevent such a thing from happening. (00:15:25)
Suggested correction: Not a plot hole at all. Most of the people who are allowed in those areas will be government employees, who will be deemed trusted enough to follow the rules.
Continuity mistake: Once Ben and Amy are reunited, he gives her some money and tells her to go as far away as she can go, with her protesting. During this, he places his hands on her head to look at her. When the angle changes from showing her to him, his fingers are positioned differently each time. (01:34:25)
Audio problem: When the redhead twin shoots the woman creature through the head with an arrow and says "That was for Mika", his mouth does not match up with what he says. (00:47:40)
Revealing mistake: When Picasso removes the first finger from Fan Yau Lee's hand, you can see that there is no blood on the instrument used.
Revealing mistake: Right in the beginning of the movie, we see young Viktor holding a gun to a young girl, about to shoot her. The gun is a revolver and as it comes into focus, you can see there are no bullets in the gun. This is part of a later scene in the movie where Viktor kills his first two people. As he's shooting, you can again see there are no bullets in the gun. (00:01:20 - 00:23:10)
Visible crew/equipment: As Jack and George enter the boat site they hide behind a red Jaguar XFR. As the camera moves round the camera man is visible in the chrome-work on the Jaguar. (01:35:20)
Continuity mistake: When John holds the match in the cave, the amount of match remaining varies between shots.
Revealing mistake: When the three characters are playing with legos and Matt is told to start playing music from his ipod, you can see that the sound is off and the ipod is paused when the music is apparently playing.