“Stars matter more than ever,” said Bryan Lourd, the Creative Artists superagent who orchestrated the “Knives Out” deal. “When stars meet material that is their fastball, it cuts through all the noise.”There are other explanations for the barrage. In a severely disrupted marketplace, stars are seeking safety in numbers; no one person can be held responsible for failing to deliver an audience, as with “Nightmare Alley.” Movie marketing has also changed, becoming less about carpet-bombing prime-time TV with ads and more about tapping into social media fan bases. Ms. Grande has 284 million Instagram followers. (Pity Mr. DiCaprio and Mr. Holland, with only about 50 million apiece.)Ms. B …
