Happy 70th, Bob Dylan! Well, almost. Here in New York, the Film Forum movie theater is celebrating the troubadour's upcoming birthday with a double feature of two films that celebrate a younger Dylan: the 1967 documentary “Don’t Look Back” and “The Other Side of the Mirror,” a compilation of Dylan’s appearances at the Newport Folk Festival. New York Times film critic A.O. Scott recently took in both movies and joins us to share his reaction.