History Trivia / OnceUponATimeInHollywood

** Although Creator/BurtReynolds, who was originally cast as George Spahn, died before he could film any of his scenes, he still managed to contribute one element to the final film. Upon learning that Creator/BradPitt was going to play Cliff, Reynolds told Tarantino "You've gotta have someone say 'You're pretty for a stunt guy'" to Cliff. The line as suggested by Reynolds appears verbatim in the final film.

** Creator/RomanPolanski's wife Creator/EmmanuelleSeigner publicly spoke against the depiction of him in the film (the film making some oblique references to Polanski's conviction for statutory rape certainly wouldn't have helped), amidst other criticisms she had about it and Tarantino (possibly on Polanski's behalf, since he couldn't really voice it out himself without attracting more controversy).

** Creator/RomanPolanski's wife Emmanuelle Seigner publicly spoke against the depiction of him in the film (the film making some oblique references to Polanski's conviction for statutory rape certainly wouldn't have helped), amidst other criticisms she had about it and Tarantino.

** Creator/RomanPolanski's wife Emmanuelle Seigner publicly spoke against the depiction of him in the film, amidst other criticisms she had about it and Tarantino.

** Chilean Lorenza Izzo as the Italian Francesca Cappucci.

** Creator/RomanPolanski's wife Emmanuelle Seigner publicly spoke against the depiction of him in the film, amidts other criticisms she had about it and Tarantino.

* ApprovalOfGod:
** Debra Tate was initially very apprehensive about the project as she feared the murder of her sister Sharon would be salaciously exploited (she's been defending her sister's memory against exploitation for decades), but after talking with Creator/QuentinTarantino and reading the script, she gave it her blessing. Debra also admitted that she wept when she saw Creator/MargotRobbie perform as Sharon, saying that Robbie nailed the role: "[[SugarWiki/HeartwarmingMoments I actually got to see my sister again nearly 50 years later]]."
** Completely averted with Bruce Lee's daughter Shannon, who took great issue with her father being portrayed as simply an ArrogantKungFuGuy with none of his deep philosophical thoughts on display.

* DisownedAdaptation: Creator/RomanPolanski's wife Emmanuelle Seigner publicly spoke against the depiction of him in the film, amidts other criticisms she had about it and Tarantino.

* BannedInChina: A peculiar case. China rejected the film not because of its explicit content, but because of the questionable portrayal of Bruce Lee (as mentioned below), who remains a cinematic icon in China.
* CameoProp: The Maltese Falcon seen in the book store visited by Tate is the real Maltese Falcon, now owned by Creator/LeonardoDiCaprio.

** Creator/JamesMarsden was announced to play Burt Reynolds, who in 1969 was a frequent guest star on TV westerns, as an in-joke with the real Reynolds also being in the film, but he ultimately doesn't appear in the film. It's unclear whether he was cut because of Reynolds' death.

** Korean-American Mike Moh as the Chinese-American Bruce Lee.

** A CastingGag in Maya Hawke's character Flowerchild being uncomfortable with killing considering her mother is The Bride.

* ThoseTwoActors: Creator/MargotRobbie and Creator/LeonardoDiCaprio are reunited six years after ''Film/TheWolfOfWallStreet''.

* ProductionPosse: As usual, Tarantino brought some veterans of his filmography in -- Creator/BradPitt from ''Film/InglouriousBasterds'', Creator/LeonardoDiCaprio from ''Film/DjangoUnchained'', Creator/BruceDern from ''Django Unchained'' and ''Film/TheHatefulEight'', Creator/KurtRussell from ''Film/DeathProof'' and ''The Hateful 8'', Zoe Bell from ''Death Proof'' and ''Django Unchained'', and Creator/MichaelMadsen from ''Reservoir Dogs'', ''Kill Bill'' and ''The Hateful 8'', and Perla Haney-Jardine from ''Kill Bill''. He also gave a small role to Maya Hawke, daughter of posse member Creator/UmaThurman. Two posse members, Creator/TimRoth and Creator/JamesRemar, had their scenes cut but still show up in the credits. Tarantino goes as far as lampshading this in the credits, grouping most of his regulars under the heading "The Gang".

* ProductionPosse: As usual, Tarantino brought some veterans of his filmography in -- Creator/BradPitt from ''Film/InglouriousBasterds'', Creator/LeonardoDiCaprio from ''Film/DjangoUnchained'', Creator/BruceDern from ''Django Unchained'' and ''Film/TheHatefulEight'', Creator/KurtRussell from ''Film/DeathProof'' and ''The Hateful 8'', Zoe Bell from ''Death Proof'' and ''Django Unchained'', and Creator/MichaelMadsen from ''Reservoir Dogs'', ''Kill Bill'' and ''The Hateful 8''. He also gave a small role to Maya Hawke, daughter of posse member Creator/UmaThurman. Two posse members, Creator/TimRoth and Creator/JamesRemar, had their scenes cut but still show up in the credits. Tarantino goes as far as lampshading this in the credits, grouping most of his regulars under the heading "The Gang".

** Creator/MacaulayCulkin was considered for an unspecified role, but was passed over after he bombed his audition, [[ https://www.esquire.com/entertainment/movies/a30783321/macaulay-culkin-once-upon-a-time-in-hollywood-quentin-tarantino-audition/ by his own admission]].

* Creator/MacaulayCulkin was considered for an unspecified role, but was passed over after he bombed his audition, [[ https://www.esquire.com/entertainment/movies/a30783321/macaulay-culkin-once-upon-a-time-in-hollywood-quentin-tarantino-audition/ by his own admission]].

* WordOfGod: When asked what happened to Rick Dalton following the events of the film, Quentin Tarantino [[https://www.cinemablend.com/news/2489384/quentin-tarantino-reveals-what-happened-to-ouatihs-rick-dalton-after-that-flamethrower-scene revealed]] [[spoiler:that news quickly spread about him using his flamethrower to thwart the hippies and he became a an In-Universe MemeticBadass. As a result, studios began offering him roles and ''The 14 Fists of [=McCluskey=]'' saw frequent airings on television.]]

* StealthPun: Cliff is played by Brad Pitt and owns a pit bull.
** Possibly underscoring this, [[https://www.imdb.com/title/tt7131622/goofs?ref_=ttcc_ql_2 according to]] Website/IMDb, the slightly anachronistic watch Cliff wears is a Citizen Challenge Timer "Bullhead."

* ApprovalOfGod: Debra Tate was initially very apprehensive about the project as she feared the murder of her sister Sharon would be salaciously exploited (she's been defending her sister's memory against exploitation for decades), but after talking with Creator/QuentinTarantino and reading the script, she gave it her blessing. Debra also admitted that she wept when she saw Creator/MargotRobbie perform as Sharon, saying that Robbie nailed the role: "[[SugarWiki/HeartwarmingMoments I actually got to see my sister again nearly 50 years later]]."
** Completely averted with Bruce Lee's daughter Shannon, who took great issue with his being portrayed as simply an ArrogantKungFuGuy with none of his deep philosophical thoughts on display.

** Producer Marvin Schwartz was 41 in 1969. He's played by Creator/AlPacino, who was 78 during the filming.
*** Although the character makes a point of saying he is ''not'' Marvin ''Schwartz'', he is Marvin ''Schwarz''.

* DuelingWorks: This movie is actually the ''third'' in 2019 to take inspiration from the Manson Family murders. A few months previously came ''The Haunting of Sharon Tate'', a horror movie starring Creator/HilaryDuff that was panned upon release and quickly forgotten; and ''Charlie Says'', a drama starring Creator/MattSmith as Manson that received mixed reviews. There's also Season 2 of ''Series/{{Mindhunter}}'' which was released a few weeks later, in which the ''same actor'' plays Manson.

* FakeAmerican: Australians Creator/MargotRobbie and Creator/DamonHerriman as Creator/SharonTate and UsefulNotes/CharlesManson.

* WordOfGod: When asked what happened to Rick Dalton following the events of the film, Quentin Tarantino [[https://www.cinemablend.com/news/2489384/quentin-tarantino-reveals-what-happened-to-ouatihs-rick-dalton-after-that-flamethrower-scene revealed]] [[spoiler:that news quickly spread about him using his flamethrower to thwart the hippies and he became a an In-Universe MemeticBadass. As a result, studios began offering him roles and ''The 14 Fists of McCluskey'' saw frequent airings on television.]]

** Possibly underscoring this, [[https://www.imdb.com/title/tt7131622/goofs?ref_=ttcc_ql_2 according to [=IMDb=]]], the slightly anachronistic watch Cliff wears is a Citizen Challenge Timer "Bullhead."

* DyeingForYourArt: Creator/LeonardoDiCaprio undertook a strict workout routine in order to convincingly play an action star, giving up pastas and desserts and doing hundreds of push ups per day. Ironically, Rick Dalton gains 15 pounds from his time in Italy, and it shows.

** Possibly underscoring this, according to IMDb, the slightly anachronistic watch Cliff wears is a Citizen Challenge Timer "Bullhead.".

*** Although the character makes a point of saying he is ''not'' Marvin Schartz, he is Marvin Schwarz.

* Also, British Creator/DamianLewis as Creator/SteveMcQueen.

* ExtremelyLengtyCreation: Creator/QuentinTarantino worked on the script for five years.