People like to shit on 20th Century Fox, but Vaughn says they were extremely supportive. Also Fox chief Tom Rothman may not be Satan as previously assumed.
"Fox were the best partners you could imagine and I speak my mind, and if they had screwed me around, I would be shouting it from the rooftops right now," Vaughn said. "It was such a creatively-rewarding experience working with them and they were so supportive of everything. We had nine weeks of post basically to finish this movie from when we finally wrapped and I was like, 'We're never going to do this,' and they just rallied around me, gave me every tool imaginable, and just kept me feeling like we could do it. (Tom) Rothman and Emma Watts were true allies. They gave me brilliant notes and never tried to interfere, just tried to make the film better. I have no idea why Tom has the reputation he has now, because I would let the guy be my ally on any film I made whether he was a head of the studio or not."

The cast are happy the film is not in 3D
"Well, it's not in 3-D, that's a start," Fassbender told MTV when describing what separates the film from other super hero films coming out this summer. "It's not in 3-D, thank the heavens," McAvoy agreed. "I think the X-Men, the X-people, mutants, they use their powers for good, just like a superhero does, but they don't feel like superheroes. They feel like real people more — maybe that's the thing that sets it apart."

Presuming they return screenwriters Ashley Miller and Zack Stentz are also already thinking sequels and characters they'd like to introduce.
"We would like to introduce Cable. He's such a cool character and we haven't seen him in any of the films yet," they told Gigwise of the futuristic character with ties to the "X-Men" past. "Avatar" actor Stephen Lang is apparently already interested in the role and Cable co-creator Rob Liefeld previously issued a plea to 20th Century Fox, singling Lang out as the ideal actor to play the character. "Dear 20th Century Fox, Please sign Steven Lang as Cable and put him in your next X-men film. Thanks, Rob," he wrote on Twitter.

Jennifer Lawrence sought advice from Rebecca Romijn about the lengthy make-up process.
"Her advice was mostly just kind of, 'Don't worry about it. Don't listen to what they tell you,'" she explained. "Because they tell you not to drink alcohol or eat spicy food, because they remove the make-up with alcohol. And she just said, 'Don't listen to that. It will drive you crazy.' "