Plot hole: Manson is able to walk right up to the Polanski residence door, but Sharon's girlfriend and Rick Dalton are prevented because there is a security gate.
Once Upon a Time in Hollywood (2019)
1 plot hole - 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.
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: Rick Dalton's car is a 1966 Cadillac deVille. It's owned by Michael Madsen, who has a cameo in this film, and is the same car he drove in Reservoir Dogs.
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)
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.