“Pop-Up” is a triptych of stories about people affected by one event: An unemployed father (Eugene Gilfedder) finds a camera containing a single photo of a woman’s face. Smitten, he tracks her down. A Romanian immigrant (Clara Voda) attempts to overcome her heartbreak by giving away a thousand home-made pop-up cards. A sleep-deprived theatre director (Greg Powell) seeks deadly revenge on a scathing critic.