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."A Complete Unknown" is in theaters now.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 Canada for the world premiere of his 2019 movie "Ford v Ferrari" at the Toronto International Film Festival.