“Flashback” (** out of four) was an ambitious but limited melodrama about a high-school loner (Dylan O’Brien) who has a chance encounter with a man (Emory Cohen) forgotten from his youth and this leads him to literally and metaphysically journey into his past but will this alter his present and future? Writer/director Christopher Macbride utilizes an eerie and elegiac style that is at times hypnotic but also at other times (most of the time) aloof and flat. Film has story fragments from “Donnie Darko” and “Memento” but fails to congeal as a satisfying whole. Haunting music score by Anthony Scott Burns Pilotpriest.