What sounds like a glorious send-up of Jane Austen obsessives finds Keri Russell on an immersive vacation that lavishly re-creates the world of the Regency era, right down to putting her in lesser clothes and smaller quarters based on her finances. The chance to see Jennifer Coolidge freed from the shackles of “2 Broke Girls” and Russell, who was so good in “Waitress,” return to the big screen is too tasty to miss.