– Lou Ferrigno has stated in numerous interviews that he will be reprising his role as the Hulk this year in the new Avengers movie. Playing the voice, even the deep growls and snarls of the CGI Hulk. He is following this after also doing the voice for the CGI Hulk in the 2008 movie.
– In the scene where Bruce Banner is talking with Tony Stark alone, there is a glass screen dividing the two. When the camera is behind Banner, if you look very closely, Banner’s reflection on the screen is not his, but the Hulk’s.
– In the Avengers movie, Iron Man (Robert Downey Jr.) is often wearing a Black Sabbath shirt. Black Sabbath have a song called Iron Man.
– During the last fight scene in The Avengers, you will see a scene where people are running away from a building. Look on the building, that is the colantotte logo. If you don’t know, Colantotte is the company who made Tony Starks wristbands, which is an actual company.
– Almost at the end of the film when they are showing various news footage of the aftermath of the battle, Two old guys playing chess on on of the monitors , one of them talks to camera,which is Stan Lee creator of the marvel comics superheroes in the film.