Continuity mistake: During his conversation with the director, while discussing his costuming, Dalton's hair changes from messy and curled to gelled up and straight.

Once Upon a Time in Hollywood (2019)
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Directed by: Quentin Tarantino
Starring: Brad Pitt, Leonardo DiCaprio, Timothy Olyphant, Margot Robbie, Austin Butler, Maya Hawke, Sydney Sweeney
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Cliff Booth: Eh... You are?
Tex: I'm the Devil, and I'm here to do the Devil's work.
Cliff: Nah... It was dumber than that, something like Rex.
Katie: Shoot him, Tex!
Cliff Booth: Tex!
Trivia: The final feature-film to feature Luke Perry, who tragically passed away a few months before its release after suffering two strokes.
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Answer: To put some context into the scene, three members of the Manson family (Tex included) have broken into Rick Dalton's house and are holding Cliff Booth at gunpoint. Cliff, who is high on drugs asks "Are you real", to which Tex replies "I'm as real as a donut, mother fucker." Tex was trying to answer Cliff's question stating whether or not he was real, but in the most intimidating way possible, and I guess donut was the word that came to mind that described how real he was.
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