The Friends of the Montauk Library movie series begins next Thursday at 7 p.m. with “The Way, Way Back,” a coming-of-age story about a 14-year-old boy’s summer vacation with his mother and her overbearing boyfriend. Toni Collette, Steve Carell, Sam Rockwell, and Liam James star in the film, which the Philadelphia Inquirer called “sly, richly modulated, emotionally engaging, and brutally honest.”