To become Bob Dylan in “A Complete Unknown,” Timothée Chalamet spent years practicing guitar and was even outfitted with cheek plumpers and nostril expanders.

Chalamet has been building his Bob Dylan for so long that he’s been seen playing Dylan songs while in costume as Willy Wonka and on the set of “Dune.” His “Dune” co-star, Oscar Isaac (who famously played a fictional Dylan-adjacent folk musician in “Inside Llewyn Davis”), said, ”My first thought, it sounded like a really bad idea.”