On the night of August 8, 1969, Patricia Krenwinkel, Charles Watson, and Susan Atkins broke into Polanski's and Tate's house, leading to the murders of Tate (eight-and-a-half months pregnant), Sebring, Wojciech Frykowski, and Abigail Folger. In the film, they go to Tate's house to commit the murders but instead end up breaking into Dalton's house after he interrupts them. Linda Kasabian went along that night as she was the only Family member with a valid driver's license, though she did not murder anyone and stayed outside the whole time. In the film, she also goes along but does not participate. Watson told his victims, "I'm the Devil, and I came to do the Devil's business." In the film, he says it to Cliff Booth. In the film, Atkins convinces the others to seek revenge by killing Rick Dalton, star of a TV western. Since TV taught them to kill, it is fitting they kill the guy from TV, and "My idea is to kill the people who taught us to kill!" In real life, Manson Family member Nancy Pitman said: "We are what you have made us. We were brought up on your TV. We were brought up watching Gunsmoke and Have Gun – Will Travel." Sandra Good said: "You want to talk about devils and demonic and immorals and evil, go to Hollywood. We don't touch the evil of that world. We don't even skim it."
According to Rudolph Altobelli, who rented the house to Polanski and Tate, in March 1969, Charles Manson showed up looking for Terry Melcher. Polanski's friend Shahrokh Hatami also said he saw Manson enter the grounds. Hatami approached Manson, asking him what he wanted. He told Hatami he was looking for Melcher. Hatami responded the house was the Polanski residence and perhaps Melcher lived in the guest house. Altobelli told Manson that Melcher no longer lived there. This happens in the film, with Sebring in place of Altobelli and Hatami.
More InfoIn a scene, Sharon Tate goes into Larry Edmunds Bookshop and purchases a copy of Tess of the d'Urbervilles. In real life, Tate gave a copy to Roman Polanski shortly before her death. Years later, Polanski directed the film adaptation, Tess, dedicating it to Tate. Dalton mentions he owns his house on advice from "Eddie O'Brien." Tate and Polanski's Yorkie Terrier in the film is named "Dr. Sapirstein," as was Tate's Yorkie in real life, named after the doctor portrayed by Ralph Bellamy in Rosemary's Baby. The carrier she puts the dog in is the same one the real Tate actually owned. The outfit Margot Robbie wears in the Bruin Theater scene is the same one Tate wore in Eye of the Devil.
More InfoAccording to Rudolph Altobelli, who rented the house to Polanski and Tate, in March 1969, Charles Manson showed up looking for Terry Melcher. Polanski's friend Shahrokh Hatami also said he saw Manson enter the grounds. Hatami approached Manson, asking him what he wanted. He told Hatami he was looking for Melcher. Hatami responded the house was the Polanski residence and perhaps Melcher lived in the guest house. Altobelli told Manson that Melcher no longer lived there. This happens in the film, with Sebring in place of Altobelli and Hatami.
More InfoTrudi Fraser, the precocious child actor working on Lancer, is inspired by an actual character from that series. Marvin Schwarz is Dalton's agent, a role that Tarantino wrote specifically for Al Pacino. Francesca Capucci, a starlet who marries Dalton, is influenced by 1960s Italian actresses Sophia Loren and Claudia Cardinale. Billie Booth is Cliff's wife, whose death echoes Natalie Wood's. Some roles, such as Zoë Bell's stunt coordinator and Heba Thorisdottir's makeup artist, were portrayed by individuals who performed those jobs for the film.
More InfoArchive footage from many films is included in Once Upon a Time in Hollywood, including C.C. and Company, Lady in Cement, Three in the Attic, and The Wrecking Crew, in which Sharon Tate appears as Freya Carlson. Three scenes were digitally altered, replacing the original actors with Rick Dalton. One from an episode of The F.B.I., entitled "All the Streets Are Silent," in which Dalton appears as a character originally portrayed by Burt Reynolds. Another from Death on the Run, with Dalton's face imposed over Ty Hardin's. The third is from The Great Escape, with Dalton appearing as Virgil Hilts, the role made famous by Steve McQueen. For The 14 Fists of McCluskey, a WWII film within the film starring Dalton, footage and music from Hell River is used. Additionally, Martin Abrahams, Brioni Farrell, Victor Freitag, Nancy Kwan, Dean Martin, Hannes Messemer, Gordon Mitchell, Rod Taylor, Burt Ward, and Adam West appear via archive footage and sound.
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