Revealing mistake: During the sequence with the Native Americans chasing the Delorean in the beginning, in one shot looking up at the sky you can see contrails from a plane, obviously not around in 1885. (00:19:25)
Continuity mistake: During the big battle against the Chitauri, Captain America is zapped with a blaster bolt. When Thor helps him to his feet we can see a significant amount of damage done to his suit, just below the star on the right hand side. But later on after Iron Man destroys the Chitauri ship with the nuke, the damage is completely gone. (01:59:25 - 02:02:40)
Visible crew/equipment: A boom mic operator wearing a white shirt is seen reflected in the door that the female scientist opens, when the Umbrella personnel pick her up, as part of their extraction procedure. He is visible as the door is opening and very faintly when it is closed. (00:04:00)
Continuity mistake: When Max sneaks up on the raider who's sitting at the wrecked dune buggy with the dying woman and man, look at the crossbow on the ground. At first it's unloaded. Then when the raider sees Max, he reaches for it and it's suddenly loaded and ready to fire.
Continuity mistake: On the skyscraper, when Neo and Trinity kill all of the soldiers, Agent Brown comes to the roof. Neo immediately draws his guns and fires until both of his clips are empty. After that, Neo drops his guns, just as Agent Brown aims at him. During Bullet-Time there are no guns on the floor. When he hits the ground, then the guns are left and right of his legs. (01:41:50)
Revealing mistake: When we see Dark Helmets' hoverjeep in the desert, watch the front end: you can clearly make out the edge of the mirrored box they used for the "hover" effect.
Visible crew/equipment: Just after Lockdown stabs Optimus in the chest with his own sword, Cade runs closer and shoots at Lockdown. He then hides behind some bricks. In that shot, the bricks are a broken wall that is two separate pieces. Then it cuts to a different shot as Lockdown returns fire at Cade, and now the wall is one piece. Not only this, but some random guy suddenly appears in the shot next to the wall and right where the explosion happens where Lockdown shot the wall. He is wearing the same color clothes as the wall and only visible for a moment. There was no other guy present until that moment and he just suddenly appears behind Cade and gets hit. It's presumably a special effects member setting off the charge in the wall by the looks of it and it detonated before he got out of the shot. (02:30:55)
Continuity mistake: When Peter is just getting to the science lab at the beginning right after his friend gets out of his fancy car, if you look at the extras walking behind the two, you will see a bright red haired girl walking by, going towards the building, but when the camera focuses on Peter the girl is there again, walking the opposite way on the other side of the huge sidewalk. You see her about 5 times going back and forth to the building. The first few times she's alone, then she's walking with another girl. (00:05:55)
Continuity mistake: When Will Smith and the other recruits are taking their written tests, the white table first appears to be situated between the second and third men from the left. When Smith goes to the table to pull it across the room, it is much further to the right of the scene. (00:24:25 - 00:26:35)
Continuity mistake: After Stark is paralysed and slightly recovers, he goes to get his energy. Right then the blood around his left ear has vanished. Being seconds away from dying, the last thing he would think of is taking a shower.
Revealing mistake: There's one scene where they are surrounded by the foot. Leonardo reaches behind him for his katanas, but he doesn't unsheath them. If you look at his elbows, you can see gaps in the pads where the actor in the suit hasn't fully fastened the gloves to the rest of the outfit. (01:05:40)
Continuity mistake: When Lasky heads toward the conning tower, an A-7 Corsair is shown at left (and the helicopter nose has a number "3" on it). As he is led inside the tower, the camera pans up, and now the Corsair is gone, replaced by an E-2 Hawkeye (and the number "3" on the heli is gone, too). (00:06:45)
Continuity mistake: When Nick is in the spoon, the milk around him turns green.
Continuity mistake: When Snake kills the wrestler he falls forward shoulders forward, next minute his arms are over the ropes, next minute his arms are in a different position again - quite active for a dead man. (01:16:55 - 01:18:10)
Continuity mistake: In the opening scenes where the are driving home and the right front tire goes flat. Just before the Big rig truck hits them you can see that the tire is not flat. (00:07:50)
Revealing mistake: Joe is much too old to be in high school. He appears to be in his thirties (the actor playing him was 35 at the time).
Continuity mistake: When the statue of Liberty is about to crash on the street, a close shot is seen of jammed cars and hysterical people. When the shot changes to Superman flying to the rescue, the jam, the cops and the people have disappeared, and all is nice and quiet in Metropolis.
Continuity mistake: When one of the stormtroopers unties Han Solo before he is put into the carbonite, watch his wardrobe - he has a disappearing / reappearing jacket on. This is fixed to an extent on the DVD - the jacket is now lightened to almost match his shirt, but it's still shiny like leather. (01:32:05)
Suggested correction: It just looks like a jacket because it's a shadow.
Visible crew/equipment: Black support rods are visible on both of the "standing" skeletons, which are holding the medallion that Juni steals. The rods are by the skeleton's right leg bones, and are not bones. (01:09:25)
Other mistake: At the end, when Peter saves Mary Jane from the collapsing structure, he jumps up in the air and swings her to safety. However if you look at the web he is holding onto it is hanging down vertically. What did he attach the web to that was directly above him, the sky? Every bit of the structure around him was/had collapsed and the only thing remotely close to swing from was the cranes. Yet we see that was quite a distance away, so Peter would have had to shoot the web away from himself not above him. (01:47:50)