Timothée Chalamet playing Bob Dylan in "A Complete Unknown."Macall PolayJames Mangold spoke to Business Insider about his Bob Dylan biopic "A Complete Unknown."Mangold explained why Timothée Chalamet spoke in Dylan's voice on set even when he wasn't filming.He called the real Dylan's willingness to give notes on the script a "huge gift."Writer-director James Mangold remembers exactly where he was and what he was doing five years ago when he decided to make a Bob Dylan biopic.He was in a hotel room in Canada for the Toronto International Film Festival when he paused prepping for the world premiere of his 2019 movie "Ford v Ferrari" to take a meeting with Timothée Chalamet, then a young actor on the cusp of superstardom.It didn't take long for Mangold to realize he'd found his Dylan.