SPOILER ALERT: This story contains spoilers from “ Twinless ,” now in theaters.

James Sweeney has a thing for twins. In his new quirky dark comedy, “Twinless,” he and Dylan O’Brien play Dennis and Roman, two men who form an unlikely friendship when they meet at a support group for people whose identical twins have died.

In one scene, Dennis is shown watching Mary-Kate and Ashley Olsen in their 1995 comedy “It Takes Two.” Sweeney, who wrote and directed “Twinless,” reached out to the former child actors with a letter. “I think I espoused my love for them and begged them to use their likeness from the classic ‘It Takes Two,’” he recalls. “Incidentally, they’re not playing actual twins in the movie. They’re just playing people who look identical to each other.”

Since the film’s premie

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