Continuity mistake: After Hulk smashes Loki against the floor, the amount of rubble around Loki changes between shots. (01:55:25)
Continuity mistake: When Natasha is tied on the chair and the phone falls on the floor, it disappears, then reappears but turned off, and finally we see it with a shining bright green light (as it was supposedly left by her, when she left the call on hold). (00:14:15)
Continuity mistake: When Rogers, Banner and Stark are discussing about Stark Tower, the tools on the table move around.
Continuity mistake: Sunlight is alternately on the top of Captain America's head or not when he tells the two policemen to get the civilians off the streets. (01:44:50)
Continuity mistake: Right after Loki's mind control spell finishes taking hold over Hawkeye, Loki begins pulling back and Hawkeye is facing him but turned at an angle. The camera cuts while Loki is still moving his spear away and suddenly Hawkeye has a little more distance between him and Loki, and he is turned to be almost fully facing him. (00:06:15)
Continuity mistake: When Loki says "You don't have the Tesseract yet", The Other moves to him with his right hand raised. The shot cuts and it is now his left arm. (00:30:40)
Continuity mistake: In the beginning of the scene "Mountaintop Battle" while Loki and Thor argue, Iron Man flies into Thor, tossing him to the ground below. Thor's hair is messed up and dirty. The shot changes, and when it goes back to him, he is standing and his hair is clean and neatly combed. (00:47:10)
Continuity mistake: After the Chitauri have arrived, Loki stands on the Stark Tower balcony and looks on New York. In this shot, Loki is standing facing the city directly, but by the next shot, he's suddenly standing 90° in the other direction with his head turned to the right, in order to be looking the same way as in the previous shot. (01:39:30)
Continuity mistake: When Captain America and Coulson land on the Helicarrier in the jet, there is a man with an orange coat standing 2 to 3 meters away from the helicopter. In the next shot, he is at least 6 to 7 meters away from the jet. (00:31:45)
Continuity mistake: Loki escapes with the Tesseract and when in the tunnel shoots a cop car with two men inside. After the car flips over, it's obvious that the car is empty. (00:09:00)
Continuity mistake: Watch Fury's collar as he's telling Hill to have all of Phase 2 equipment on a truck and gone. In different shots, the way it's folded out or standing straight up is never consistent. (00:02:50)
Continuity mistake: After the Tesseract opens up the portal that Loki enters from, 4 SHIELD guards are seen slowly advancing on his position. On the left side of the device, two of them are moving. The one further behind walks over an area of the floor that is illuminated by some orange light. The shot cuts to his feet, and suddenly the floor is dark. (00:05:00)
Continuity mistake: Capt. America has just destroyed the first punching bag and walks away to pick up a new one. There are now 5 bags left. Note the chains belonging to the third one from the left. The way they lie on the floor differs in from shot to shot. (00:21:15 - 00:21:55)
Continuity mistake: When Natasha Romanoff is telling Bruce Banner about the Tesseract, she sits down at the table, resting her arms on the table. The shot cuts, she is leaning back instantly. (00:18:10)
Continuity mistake: In the scene where Agent Coulson enters Stark Tower near the beginning, as he enters, Pepper looks up at him. In the next shot, she is looking at Tony, and then in the next shot, she's looking at Coulson again. (00:25:00)
Continuity mistake: There is a deleted scene of Steve Rogers looking through the files of his former comrades. When he first reads the sheet for Peggy Carter it has her address printed in a modern typeface on a label stuck to the page. The next time we see it, the details are the original typeface on the original paper.
Continuity mistake: In the fight scene between Thor and Iron Man, after Captain America tells Thor to put the hammer down, Thor slaps Iron Man, who is to Thor's right side, back several feet away from them and then jumps even further away. After Thor hits the Captain's shield, as they are all getting up, Iron Man is right next to Captain America and Thor, now to Thor's left side, (when he should be about fifty feet away and still to Thor's right side). Even if Iron Man made it back to Captain America before the shock wave, he should still have been visible before the shock wave for his position on the ground to be possible. (00:49:40)
Continuity mistake: When Thor smashes the hammer against Captain America's shield, they are pushed at least ten feet away from each other. Yet when Iron Man gets up and walks over to Captain America, the two are suddenly much closer together. (00:47:45)
Continuity mistake: When Thor says "I have unfinished business with Loki", you can see Hawkeye in the background removing the spent heads of his arrows, four of them, two a little lower then the rest. The shot cuts, and he is holding all four at the same height. (01:46:05)
Continuity mistake: When Thor attacks Captain America and says "You want me to put my hammer down?" Captain America raises his shield, but when the angle changes it's lowered and he's raising it again. (00:49:45)
Answer: During the end sequence of The Incredible Hulk Banner discovers that he can aim the Hulk in the right direction, give it a goal, which he uses to defeat the Abomination in that film. Key to that appears to be willingly accepting the transformation into the Hulk, which he does by choosing to jump from the helicopter. On the Helicarrier, Banner doesn't want to transform, it's caught him by surprise, he's fighting it, which is why it takes ages, is seemingly very painful and, as an involuntary change, the Hulk is out of control. In the final battle, Banner chooses to make the transformation, to "suit up", as it were, and thus the change is swift, painless and results in the cooperative Hulk capable of working with the others towards a goal.
Tailkinker ★