I'm super-excited for "Once Upon a Time in Hollywood," which opens tomorrow. A few thoughts: *This movie tells--partly--the story of Sharon Tate. Ms. Tate was married to Roman Polanski and nurturing a young film career when Charles Manson's minions murdered her. Hollywood in the sixties seems to be a special obsession of Tarantino's--dating to childhood--and I'm pleased he's exploring it here. (John McPhee says, "If the thing didn't interest you in your teens, it's never going to be a great subject for you to write about.") *How strange to blend real and fictional characters. Like "Ragtime." DiCaprio and Pitt are playing fake people, but they will be in the company of Tate and Polanski, among others. *Acting is about gestures. "Lightning in a bottle" is when a performer does something surprising and real, on camera. I'm obsessed with one Margot Robbie moment in the trailer. She says, "I play Mia--the klu...