Starring: Leonardo DiCaprio, Brad Pitt, Margot Robbie, Emile Hirsch, Margaret Qualley, Timothy Olyphant, Julia Butters, Austin Butler, Dakota Fanning, Bruce Dern, Mike Moh, Luke Perry

Director: Quentin Tarantino

UENTIN TARANTINO renews his vows as a devout fanboy, rifling through his formative influences in vintage American B-movies and TV, spaghetti Westerns, martial arts, popular music and an endless assortment of cultural ephemera in “Once Upon a Time in Hollywood.” In his ninth feature, the writer-director at the same time is having sly fun riffing on his own work, in particular his penchant for gleeful revisionist history.

The central characters — played by returning Tarantino cohorts Leonardo DiCaprio and Brad Pitt in entertainingly loose performances dripping with self-irony and pleasurable chemistry — are faded television cowboy Rick Dalton and his longtime stunt-double Cliff Booth. But since an excess of DUIs cost Rick his license, war hero Cliff is now more of a driver and all-round gofer, doing little actual stunt work, while Rick’s planned transition into action movies has failed to catch fire.

With richly detailed input from production designer Barbara Ling and beyond-cool retro fashions from costumer Arianne Phillips, Tarantino folds the low-key buddy comedy into a lovingly re-created, almost fetishistic celebration of late ’60s Hollywood, infused with color and vitality by cinematographer Robbie Richardson.

Running parallel to Rick and Cliff’s story are glimpses into the more glamorous lives of Rick’s Cielo Drive neighbors, Sharon Tate (Margot Robbie) and Roman Polanski (Rafal Zawierucha), whose proximity only makes Rick’s exclusion from the New Hollywood club sting more. At a Playboy Mansion party, while Sharon dances with Michelle Phillips and Mama Cass, Damian Lewis drops by as Steve McQueen to explain that Sharon’s ex-fiance, hairdresser Jay Sebring (Emile Hirsch), remains in the picture waiting for Polanski to screw up the marriage.

Then there are the clusters of female Manson family acolytes, either dumpster-diving for food or hanging out on street corners to give tourists a thrill. Rick dismisses them as hippie trash, while Cliff is more intrigued, particularly by a flirty nymph in a crochet halter top and denim cutoffs named Pussycat, played by Margaret Qualley in a performance of insouciant sexual authority.

One of the movie’s best scenes comes when Cliff drives Pussycat home to the disused Spahn Movie Ranch and has an uneasy meeting with her adoptive family members, including wary earth mother Gypsy (Lena Dunham) and an openly hostile Squeaky Fromme (Dakota Fanning). Cliff knows the place well from the days of Rick’s TV show “Bounty Law,” and his insistence on seeing the owner, George Spahn (Bruce Dern), leaves him with more questions than answers. The classic Western element of a cocksure stranger moseying into a town where he’s met by suspicious gazes fits neatly with Tarantino’s thematic interest in the outsize influence of Hollywood on American life.

The movie deals with the period immediately surrounding the Manson murders, and Tarantino puts his own playful spin on that horrific chapter of Hollywood history.

Polanski remains a background figure, away on a shoot in England on the fateful night, but Tate floats through the movie like a golden-haired dream goddess in miniskirts and go-go boots. Robbie is given disappointingly little to do aside from looking gorgeous, but she has one captivating scene in which Sharon wanders into a movie theater to watch the Dean Martin spy caper “The Wrecking Crew,” in which she co-starred, her face lighting up with every audience reaction to the real Tate’s klutzy comedy onscreen.

Tarantino has frequently been more a maestro of the linked vignette than a disciplined narrative storyteller, and that’s very much the case here as the bulk of the movie zigs and zags through the experiences of Rick and Cliff, touching on Hollywood lore both based in fact and purely fictional.

A mention that Cliff got away with killing his wife segues to a brief scene snippet with implied echoes of Natalie Wood’s death. And there’s an amusing faceoff with Bruce Lee (Mike Moh) on the shoot of “The Green Hornet,” which gets Cliff kicked off the set by the stunt coordinator.

What Tarantino really gets off on here is playfully re-creating the magic of Hollywood 50 years ago.

A rushed account of Rick’s six months in Italy shooting spaghetti Westerns and Bond knockoffs — a career move orchestrated by Al Pacino as a smarmy agent — feels like a perfunctory genuflection to Tarantino idols like Sergio Corbucci.

“Once Upon a Time in Hollywood” is uneven, unwieldy in its structure and not without its flat patches. But it’s also a disarming and characteristically subversive love letter to its inspiration, in which Tarantino rebuilds the Dream Factory as it existed during the time of his childhood, while rewriting the traumatic episode often identified as the end of that era. (SD-Agencies)