Random Trivia For This Title:
- It took Marvel three tries with the MPAA to grant the film a 'PG-13' instead of an 'R' rating because of Agent Coulson's death scene. Originally, Loki's staff was seen bursting through his chest; instead, a gruesome sound effect was added after Loki appears behind him, and then a quick-cut to Thor's reaction.
- In the final end credit scene, Captain America is the only one not eating. That is because Chris Evans got a buzz cut and grew out his beard after The Avengers was done filming. He was called in later to do this extra scene and refused to shave off his beard due to having been filming Snowpiercer at the time, so they gave him the prosthetic jaw. He holds his hand over his face because the prosthetic made him look like he'd been attacked by a hive of angry bees. He also is unable to eat or talk with the prosthetic on. The wig he wears as Captain America is also quite clearly visible in certain shots of this scene.
- The filmmakers secured the rights from Columbia Pictures to feature OsCorp Tower from The Amazing Spider-Man (2012) in New York. Unfortunately, by then digital rendering of the skyline was already complete and it could not appear.
- Captain America finds Phase 2 weaponry in the secure storage area of the helicarrier. Those weapons are emblazoned with the Hydra logo.
- Originally Joss Whedon had not intended the film to include supporting characters from the heroes' individual films, reasoning "You need to separate the characters from their support systems in order to create the isolation you need for a team." However, he eventually decided to cast Stellan Skarsgård, Paul Bettany and Gwyneth Paltrow (Paltrow was cast at Robert Downey Jr.'s insistence).
- Chris Hemsworth had to increase and expand his dietary/food intake in order to maintain the physique he built up for Thor, consisting of chicken breasts, fish, steak and eggs every day (Hemsworth said he had to consume "his body weight in protein.").
- Samuel L. Jackson's Nick Fury is from the Ultimate Marvel Universe created in 2000 to re-imagine and update the Marvel heroes for the 21st century. Fury's likeness was actually based on Jackson, who gave Marvel permission to do so. Subsequently, based on that likeness and his star power, Jackson was cast as Fury for all Marvel superhero films owned by Marvel/Disney starting with Iron Man.
- The German police car skidding on its front end after Loki blasts it was a complete accident, as it failed to flip over initially.
- The final end credit scene was added after Robert Downey Jr.. encouraged a scene rewrite: after Tony Stark falls back to Earth, he originally awakens and asks, "What's next?". Robert Downey Jr. thought the line could be more interesting, and the idea of going to a local shawarma restaurant was born. The scene was added one day after the global premiere. Since then, shawarma sales in Los Angeles, St. Louis, and Boston have reportedly skyrocketed.
- The first Marvel film to make 1 billion dollars.
- Samuel L. Jackson's role as Nick Fury in this film makes him the second actor (after Hugh Jackman, who has appeared in all the X-men movies) to play the same comic book superhero in five different movies.
- Chris Evans was unsure about his character's line, "I understood that reference!" because he was worried that it would make audiences think that his character was unintelligent. However he was quickly comforted after he watched the movie with an audience and he saw that they found the line humorous as opposed to stupid.
- Joss Whedon explained that two of the founding Avengers members Ant-Man and Wasp were cut from the script because the film had too many characters.
- After Thor takes Loki off the Quinjet down on the mountain side, two large ravens fly by them as they are talking. In Norse mythology, their father, Odin, had two ravens, Huginn and Muninn, who would bring Odin information from Midgard (Earth).
- There were very few times that everyone was in town at once, but on one night when they were, Chris Evans sent them all a text message simply saying "Assemble" (the tagline to the movie), prompting a night out on the town. Clark Gregg has stated that this is his favorite text message that he has ever received.
- Seconds before Hawkeye's attack on S.H.I.E.L.D's Helicarrier, Bruce Banner finds the Tesseract's location on the computer. This explains why later he arrives in New York during the invasion of the Chitauri after the Hulk (Banner transformed) fell to the ground from the helicarrier during Hawkeye's attack.
- Robert Downey Jr. kept food hidden all over the lab set and apparently nobody could find where it was, so they just let him continue doing it. In the movie, that's his actual food he's offering and when he was eating, it wasn't scripted. He was just hungry.