Palm Royale wears its time period like a sweetheart-neckline cocktail dress. From sunglasses and boat shoes to headscarves, wallpaper, and large automobiles, it’s as good a job of material-historical re-creation as you’ll see on television. Every element has been researched, designed, and presented with the utmost care. When Kristen Wiig’s Maxine Dellacorte sits poolside reading the local society pages or Allison Janney’s Evelyn rocks a pair of sunglasses big and bold enough to get filched by Truman Capote...