In an awards season dominated by “Boyhood” and “Birdman,” the Writers Guild of America on Saturday honored two different choices with their top film awards: “The Grand Budapest Hotel” and “The Imitation Game.” In the original screenplay category, Richard Linklater’s “Boyhood” lost out to Wes Anderson and Hugo Guinness for their darkly whimsical, candy-colored fable “The Grand Budapest Hotel.” Anderson and Guinness recently picked up the BAFTA for best screenplay as well and are considered favorites to win the Academy Award. “True Detective” writer and creator Nic Pizzolatto took the award for best drama series and best new series.