Other mistake: Cliff's dog is referred to as female but when it jumps up at a door towards the end of the film, it is male.

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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More mistakes in Once Upon a Time in Hollywood More quotes from Once Upon a Time in Hollywood More trivia for Once Upon a Time in Hollywood
Cliff Booth: Hey! You're Rick fucking Dalton, don't you forget it.
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.
Casual Person