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
Factual error: Twice in the movie a Jumbo Jet (a Boeing 747) from Pan Am appears. The movie is set in 1969, when that plane had its maiden journey, but it wasn't flown commercially until 1970.
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.
Trivia: The final feature-film to feature Luke Perry, who tragically passed away a few months before its release after suffering two strokes.
Question: Was it intentional that Joe Namath and Ann Margaret's names were each repeated twice on the screen as Sharon Tate walked into the theatre? (01:08:00)
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Answer: Yes, though the intention was not Tarantino's. What is onscreen is the trailer of the (real) 1970 film "C.C. and Company", which starred (as you might have guessed) Joe Namath and Ann-Margret. Said trailer showed their names twice, a stylistic choice that emphasized the film's stars, and Tarantino used the unaltered trailer in the film.