“Sentimental Value” is the Thanksgiving film for the fractured family

For as tender and quietly introspective as Joachim Trier’s “Sentimental Value” eventually becomes, the Norwegian writer-director’s latest film opens in a frenzy. Nora (Renate Reinsve), a young but respected theater actor starring in a flashy new production of Chekov’s “The Seagull,” is deep in the throes of a panic attack. Stricken with a bout of crippling stage fright, Nora’s nerves have turned her into a roiling whirlpool of carnal impulse, using sex and violence to try to get out of stepping onstage. When neither works, Nora tears at her costume and hair before being calmed to a lull by stagehands who successfully manage to get their star in front of the audience and on her mark. It’s not that Nora is nervous about the performance. Rather, she’s worried about what the response will be.