Joan Cutler has an impossible decision to make in “Eternity.” The newly deceased character, played by Elizabeth Olsen, has one week to decide who she wants to spend her afterlife with and two husbands lurking and hoping that she’ll choose them. Luke is the dashing one who died in the Korean War right as they were starting a life together. Larry is the other one, kind of common, kind of a crank, but the person who she was married to for 65 years. Movie Review: Elizabeth Olsen, Callum Turner and Miles Teller lead clever, charming ‘Eternity’ Apparently even death is no respite from earthly puzzles like the love triangle. Sure it’s messy and confusing for those involved but it’s also one of the great storytelling setups for a screwball comedy. And this particular film, imaginative and shrewdly whimsical with an utterly charming cast, delivers on the promise. Lucky us. Most of the film takes place in the Junction, a comically ordinary, brutalist-style hotel/convention center, expo-style trade show in which the recently departed shop around for …