In September, Rosamund Pike sat down with Variety for a 2.5-hour wide-ranging interview about her breakout role in “Gone Girl.” She spoke about how she prepared to play Amy Dunne, which included working with a dialect coach and training with a professional boxer, and she revealed secrets about the movie’s ending, which we agreed not to publish until after its release. There are many spoilers below, so stop reading now if you haven’t seen “Gone Girl” yet.

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(1) Pike filmed the “evil Amy” scenes, where she resurfaces alive in the woods, on the first day of shooting.
“We started day one of filming some of the stuff where she’s on the run, and she’s playing another person. That’s very hard. You haven’t played the person who is morphing into someone else.”

(2) The gruesome sex scene.
After Amy is robbed, she calls her boyfriend Desi (Neil Patrick Harris) and ends up murdering him during a graphic love scene. Pike says that was one of the most challenging parts of the film to shoot, because it involved a hidden rig attached to prosthetic skin that squirted blood when Amy slits Desi’s throat. “It covered us,” Pike said. “Then we got to a certain point, we froze, and more blood was added. You want it to go in certain places and not others, you mesh it with your body, because you struggle. Some of it gets painful, as it dries, your skin stick to each other and it’s like super glue.”

(3) The makeup department experimented with blood tests.
“There were so many people trying to come up with the perfect version of film blood,” Pike says. “Different shades, different consistencies. It has squirt in the right way, it has to spread in the right way, it has to seep into fabric in the right way. If it’s too sticky, it’ll make lines like syrup, which is no good. I spent so much time covered in blood in the film. And you have to reset it and wipe it off.”

(4) The c*nt scene.
When Amy returns home to Nick, they have an heated exchange prior to a TV interview they are doing as a couple. “Ben [Affleck], David [Fincher] and I rewrote that scene. He says, ‘You’re such a c*nt.’ I say, ‘I’m the c*nt that makes you the man you are today–the only time you ever feel like yourself.’ That’s Amy’s confidence. She’s right–she knows that gets him. And that’s the toxicity of their relationships right there. It’s a pretty damning message.”

(5) She hasn’t considered the possibility of a “Gone Girl” sequel.
“No, no, no,” she says at the suggestion, but leaves a small door open. “Only if Gillian [Flynn] wrote it. I don’t like the idea of someone coming in and saying I could get my hand on these characters. The filmmakers don’t even want people to know Amy is even alive at the end. People have been good about.”