Deliberate mistake: After dropping Rick off at the set, we see Cliff driving his car back to the house to fix the antenna. View forward from inside the car, the rearview mirror is obviously missing. The next scene, outside with the car coming toward you, the rearview mirror magically reappears.

Once Upon a Time in Hollywood (2019)
1 deliberate mistake - chronological order
Directed by: Quentin Tarantino
Starring: Brad Pitt, Leonardo DiCaprio, Timothy Olyphant, Margot Robbie, Austin Butler, Maya Hawke, Sydney Sweeney
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.
Bruce Lee: My hands are registered as lethal weapons. We get into a fight, I accidentally kill you? I go to jail.
Cliff Booth: Anybody accidentally kills anybody in a fight, they go to jail. It's called manslaughter.
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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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