Peter Debruge Chief Film CriticWay back in 1998, before Marvel made metaverses a household concept, Gwyneth Paltrow starred in a lovely parallel-realities drama called “Sliding Doors,” in which a woman’s life split along two paths, depending on whether or not her character caught a specific train. At the time, juggling these competing fates was considered to be so demanding that the filmmakers obliged one of the two Gwyneths to get a haircut, so audiences could tell them apart.Nearly a quarter-century later, our collective cine-literacy has gotten so sophisticated that “Sliding Doors” seems no more challenging than a simple game of tic-tac-toe.