Yes, there are several movies titled "Once Upon a Time." One of the most notable is "Once Upon a Time in the West" (1968), directed by Sergio Leone, which is a classic Western film. Another is "Once Upon a Time in America" (1984), directed by Sergio Leone as well, focusing on the lives of Jewish gangsters in New York City. Additionally, there are various films and adaptations with similar titles, including animated features and fairy tale interpretations. The title is commonly used in storytelling to evoke a sense of fantasy and nostalgia.

In "Once Upon a Time in Hollywood," the controversial ending features an alternate history where the infamous Manson Family murders are dramatically averted. In this climax, Leonardo DiCaprio's character, Rick Dalton, and Brad Pitt's character, Cliff Booth, confront the Manson followers, resulting in a violent showdown. This fictional twist diverges from real history, as it depicts the brutal murder of actress Sharon Tate and others being prevented. This creative choice sparked discussions about historical accuracy, artistic license, and the portrayal of violence.

As of October 2023, "Once Upon a Time" is not available on Netflix in the United States. However, it may be accessible on other streaming platforms, such as Disney+, where it is more commonly found due to its association with Disney properties. Availability can vary by region, so it's always a good idea to check your local streaming services for the latest information.

In Quentin Tarantino's "Once Upon a Time in Hollywood," Cliff Booth, played by Brad Pitt, is a fictional character. However, he is inspired by several real-life figures from the late 1960s Hollywood scene. Some elements of Cliff's character draw from the lives of stuntmen and actors of that era, particularly those who worked closely with iconic figures like Bruce Lee. While Cliff Booth himself does not represent a specific real person, he embodies the spirit and experiences of the Hollywood stunt community during that time.