First, check this 3-min video. Jamie talked about his physical transformation to play a skinhead. Not just fake tattoos, but also contact lenses and fake teeth. They also did something to his ears. In the end, he said he usually was not threatening-looking to people because many still remembered him as that sweet boy who played Billy Elliot. PS, in this video, he also did an old waitress' voice in a diner, it's GOOD!
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