From Wired: "Dialect coach Erik Singer once again analyzes the accents of some of Hollywood's biggest names. How accurate were their accents, really?"
He looks at Margot Robbie's Pacific Northwest accent in I, Tonya ("fantastic"), Giancarlo Esposito's Chilean/Mexican accent in Better Call Saul ("entirely appropriate"), Jennifer Lawrence's Russian accent in Red Sparrow ("doesn't fully cohere"), and 25 other actors' attempts at accents.
