Trivia: While on the helicarrier, Tony Stark is wearing a Black Sabbath T-shirt, the band who released the song "Iron Man".
Trivia: Mark Ruffalo is the only actor to be credited as both Bruce Banner and the Hulk.
Trivia: When Loki is grabbed by the Hulk and repeatedly smashed into the floor, Tom Hiddleston had a rope tied around his ankle which was pulled to achieve the effect. Although, Tom was told that the rope would be pulled while speaking to the Hulk, he was never told when the rope would be pulled so his reaction to quickly be pulled down was real.
Trivia: When Bruce Banner is explaining to everyone how he can't die, he tells them that he once put a gun in his mouth and pulled the trigger, but that the Hulk spit out the bullet. This was supposed to be the original opening scene for The Incredible Hulk starring Edward Norton.
Trivia: Robert Downey Jr. jokingly improvised the line referring to one of the techie's playing Galaga. Director Joss Whedon loved the line so much, he added in the later shot where we see the techie literally playing Galaga.
Trivia: In the final scene of the film, as Tony is unfolding the blueprints for the new Stark Tower, if you look very carefully (slo-mo may be necessary) you can see files with a symbol representing each Avenger in the upper right corner of each file - Captain America's shield, Thor's hammer, etc. The implication being that Tony will build a section of Stark Tower for each of his friends.
Trivia: For the post-credit scene where the group are eating shawarma together, Chris Evans had to wear a prosthetic jaw, because he had grown a beard for another movie and couldn't shave it off. It's also why he's resting his head on his hand through the entire scene, conveniently covering up most of his face.
Trivia: After the Hulk falls into the isolated building and wakes up as Bruce Banner, the security guard who assists him and subsequently asks: "Are you an alien?", is Harry Dean Stanton from the classic film 'Alien'.
Trivia: Paul Bettany, who voices Jarvis in this and the standalone Iron Man films, hasn't seen any of them. In an interview he said "This is robbery. I walk in, I say some lines on a piece of paper for two hours, and then they give me a bag of money and I leave and I go about my day...I've never seen one of them...It's not because of any snobbishness, it's just not my thing."
Trivia: Stan Lee had two cameos in the movie but his first appearance was cut. In the scene when Steve Rogers is at the cafe seen in the final fight where he first encounters the waitress who had become infatuated with Captain America after he saves her. Stan Lee basically calls Steve a moron for not asking for her phone number.
Trivia: The Avengers co-creator Stan Lee makes his usual cameo. This time as a man being interviewed by a news reporter asking about superheroes, at the end of the movie.
Trivia: When Stan Lee is being interviewed, in the top left corner of the screen Stan Lee is one it says "FILE: A113" A-113 references a graphic design and character animation classroom at California Institute of the Arts, and is often referenced by alumni.
Trivia: The collector cards owned by Coulson are actually covers of some Captain America comic books.
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 ★