Quentin, Jamie, and Sam all commended Kerry for her acting on the movie, explaining that she wanted every moment to be authentic, even if it meant getting whipped on camera.
Quentin said that Kerry didn't want to do it "the baby way," and that she really "took a beating" during a painful scene with Leo, where he grabs her face repeatedly.
Of course, Kerry wasn't the only one who suffered through physical pain for her role. Leo injured himself during the scene he shared with Kerry after accidentally smashing his hand over a shot glass. According to everyone on the panel, Leo kept acting right through the scene, even though his hand was spouting out blood. The scene was so good that Quentin kept it in the film.