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There’s a long list of news anchors and TV talking heads who have made cameos in movies and television shows. Examples include Chris Matthews and Charlie Rose in George Clooney’s, “The Ides of March,” Lawrence O’Donnell in Showtime’s “Homeland,” and Larry King in just about everything, from “Ghostbusters” to “The Stepford Wives.” Now, NECN’s Jenny Johnson is getting in on the action. A few days ago, the “TV Diner” cohost shot a scene in Denzel Washington’s made-in-Massachusetts movie, “The Equalizer,” playing a TV reporter outside a crime scene.