"The shooting schedule's been kind of crazy. It's such a great group of people, and we all got so close that we mainly just hang out at the Crowne Plaza -- I'm serious -- and we play music," she said.

"Pretty much everyone that's part of the cast is musically talented in some way, so we spent most of our evenings playing music and just talking and just being silly. I've been to Eat'n Park a few times. A bunch of times, actually."

"I was very nervous before we started shooting. I was very nervous about the American accent," she [said].

"[My costars] went to an American high school, they know what prom looks like, all these little details that I had no idea about. So I was a little neurotic.

"My script was covered in notes about all these American words, American slang. I was quizzing my friends about high school and prom and everything, and then Steve [Chbosky, the writer/director] was just like, 'Emma, this is great and everything, but you just really need to let all of that go' because he said he saw me as Sam, and it was kind of as simple as that."

She acknowledges an element of paranoia that a director might hire her only because of her "Harry Potter" following or some other reason, "so it really meant a lot to me that there was no one else for this role."

So any time she wanted to ask Chbosky anything, he was right there.

"He can create new dialogue with me on the spot and we can adapt and that's been the great thing about him, too, is that he realized he is making something new. Obviously he wants to be true to the spirit of the book, [but] he understands it's a movie, it's different. He's created something new with different actors."

"Steve got us all together one night and we all went to the Pittsburgh floor show [for The Rocky Horror Picture Show], and it was hysterical. We had so much fun. It was great."

"The hours and the days, it's full on. I mean, I have no time to do anything else other than basically go home, sleep, eat, shower and get ready for the next day. ... Everyone gets so close because we're on location together."

"Summit [Entertainment] didn't want me to do the stunt. I was not meant to do it at all, and I begged Stephen. I said, 'I really, really want to do this.' "

So that's how the world-famous actress found herself standing as a car traveled at 50 to 60 miles per hour, and she was tethered with a single cord.

"I had one string but hands in the air, all the way through the tunnel coming out the other end. The first time I did it, I was so emotional I cried. It was really special and beautiful, and seeing the shot of what it's going to look like, it's going to blow your mind. ... It's stunning and Steve knew when he conceptualized it that it would be amazing, but I think it exceeded even his expectations.

"What a great moment."