Director Ryan Coogler spoke about writing the blues-infused vampire film “Sinners,” nominated for a record 16 Oscars, for his late uncle. Rose Byrne, who learned of her best actress nomination in the middle of the night in Australia, talked about the intensive experience of fine-tuning her turbulent character during a five-week rehearsal process. Leonardo DiCaprio hailed the deep communal experience of people sitting in a theater together, immersing themselves in a movie. Across Hollywood,...