How ‘Once Upon a Time in Hollywood’ Making-Of Book Author Got Candid ‘Warts-and-All’ Stories From Tarantino and Cast

“Once Upon a Time in Hollywood,” Quentin Tarantino’s sprawling 1960s-set epic, has certainly been well-covered. But now there’s a way to go even deeper into the Oscar-winning film.

There was the movie itself, which starred Leonardo DiCaprio, Brad Pitt and Margot Robbie, and was released in 2019. It was nominated for 10 Academy Awards, including Best Director, Best Actor and Best Original Screenplay. It won two Oscars, for Pitt’s Supporting Actor turn as stuntman Cliff Booth, and for Nancy Haigh’s impeccable Production Design. There was also the follow-up novel, written by Tarantino and published in 2021.

Tarantino said that he has written an entire book about the films of Rick Dalton,…