The trailer for “Dashcam”—a horror road pic— has plenty of action, weird sounds, and blood. But what the producers rely on most to sell the movie are reviewer raves printed in large red type. It’s a technique all filmmakers can use, as long as their movies get thumbs up from major publications. That’s not easy,…

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There’s nothing cutting edge about séance films. One of the earliest—”House of Mystery”—was released in 1934. Found footage movies also don’t qualify as novelties. Long before “The Blair Witch Project” (1999) there was “Cannibal Holocaust” (1980). But when UK director Rob Savage made “Host” by combining those two shopworn genres into a 57-minute Zoom horror…

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