TO borrow the title of a Bob Dylan song, it was a case of “one more cup of coffee” for the film director. (Or perhaps not, as you’ll see.) When James Mangold got stuck into making his biopic A

The script of “A Complete Unknown” — written in part by Mangold and based roughly on Elijah Wald’s 2015 book “Dylan Goes Electric!” — walks a careful line. Bob Dylan films have been made before, and they have generally been good.