The first film from the Marvel's The Avengers series grossed over one billion dollars in box office sales.
To prepare for his role as "Clint Barton" alias "Hawkeye", Jeremy Renner was trained by former Olympian archer.
Samuel L. Jackson is the second actor playing one and the same comic book hero in five different films himself. Hugh Jackman alias "Wolverine" in the X-Men franchise, is the only other actor having played a superhero in five films, too.
In some scenes "Tony Stark" alias "Iron Man", played by Robert Downey Jr., is wearing a "Black Sabbath" band T-Shirt. The really interesting fact: In the 1970's, the band had a hit called "Iron Man".
Chris Evans sent a text saying "Avengers, assemble!" to all his fellow cast members to get them all to go out together one evening for a night out.
"Loki's", (Tom Hiddleston) expression when he is hurled through the air by "Hulk" (Mark Ruffalo) was filmed in a very unusual way. One of the directors had to stand behind the actor and shake him vigorously and repeatedly. Then, Hiddleston's expression was inserted into the scene using computer technology.
"Bruce Banner" alias "Hulk" has been played by a different actor in nearly every film of the series. The character has been played by Bill Bixby, Edward Norton, Eric Bana and most recently by Mark Ruffalo.
In one scene, "Bruce Banner" alias "Hulk" is asked by a security guard, played by Harry Dean Stanton, whether he is an alien. Fun fact: in 1979, Stanton played an important supporting role in the movie Alien.
The film's producers were only given permission to film in New York for three days. The rest of the movie was filmed in New Mexico and Cleveland.
The Avengers' creator Stan Lee had a small cameo in the film. He appears at the end of the film as the chess player who is listening in total disbelief to TV reports about the superheroes.
In the comics, Scarlett Johansson's character, "Natasha Romanoff" alias "Black Widow" is initially a Russian agent. However, she then becomes a U.S. agent and joins the fictional intelligence agency "S.H.I.E.L.D.", shortly after arriving in the US.