"Yeah, he was growing them," "A Complete Unknown" director James Mangold told Business Insider. "If you look earlier in the movie, there are some scenes where they aren't as long, but by the end, he had some full-on Nosferatu going on."

He really wanted to learn the parts,” harp player and instructor Rob Paparozzi says of Chalamet. “He didn't want to fudge his way through it.”

Timothee Chalamet likened his journey to playing music legend Bob Dylan to an athletic feat. It turned into a marathon that stretched longer than the actor had expected.