some fun facts/quotes from the cast about the movie:
Chris Evans: About the character's dual presence in both World War II and the modern era, Evans stated, "In The Avengers, they start to explore this. He's a fish out of water, a man not in his time, and he's just coming to terms with the way the world is now and how it's changed since the '40s." Regarding the dynamic between Captain America and Tony Stark, Evans remarked, "I think there's certainly a dichotomy — this kind of friction between myself and Tony Stark, they're polar opposites. One guy is flash and spotlight and smooth, and the other guy is selfless and in the shadows and kind of quiet and they have to get along. They explore that, and it's pretty fun".
Chris Hemsworth: He stated that he was able to maintain the strength he built up for Thorby increasing his food intake, consisting of a number of chicken breasts, fish, steak and eggs a day. When asked exactly how much, Hemsworth joked, "My body weight in protein pretty much!"
Jeremy Renner: He said it will be a very physical role and will be training physically and practicing archery as much as possible in preparation.
Mark Ruffalo: About replacing Edward Norton, Ruffalo said, "I'm a friend of Ed's, and yeah, that wasn't a great way for all that to go down. But the way I see it is that Ed has bequeathed this part to me. I look at it as my generation's Hamlet." About the character he stated, "He's a guy struggling with two sides of himself—the dark and the light—and everything he does in his life is filtered through issues of control. I grew up on the Bill Bixby TV series, which I thought was a really nuanced and real human way to look at the Hulk. I like that the part has those qualities". Regarding the Hulk's place on the team Ruffalo said, "He's like the teammate none of them are sure they want on their team. He's a loose cannon. It's like, 'Just throw a grenade in the middle of the group and let's hope it turns out well"! Ruffalo also told New York magazine that unlike previous incarnations he will actually play the Hulk, "I'm really excited. No one's ever played the Hulk exactly, they've always done CGI. They're going to do the Avatar stop-action, stop-motion capture. So I'll actually play the Hulk. That'll be fun". About his preparation for the role Ruffalo joked, "I've lost 15 pounds and I've put another five on of just strapping, pure USDA beef... They want me mean and lean, but they don't want me big and buff".
Cobie Smulders: On her costume, Smulders stated that she had tried on portions of a catsuit and saw conceptual drawings. She went on to say that "It's fascinating to me. I feel like wardrobe becomes very creative on these types of movies because they literally spend weeks designing just the pants or the emblem. It's such an all-consuming process, so I'm excited to see how it all turns out."
wikipedia.org
I just love Tom Hiddleston as Loki. 
