If you fall into that camp, I have great news for you. (This is your last spoiler warning.) The movie does indeed end with the murders of three people, but none of them are the people you might expect. Then again, if you've been asking around about the ending and maybe someone's told you to expect something like the history-warping inferno of Inglourious Basterds, you might be able to guess what Hollywood's heading towards. (Which may have been Tarantino's motivation behind sending out an open letter to Cannes Film Festival attendees this year, pleading against revealing any spoilers in their coverage.)
When we finally arrive at the night of August 8, 1969, we've watched Rick and Cliff fly back from their months-long stint making spaghetti westerns in Italy, readying themselves for a wild night before the two go their separate ways. Meanwhile, a very pregnant Sharon Tate and a few of her friends -- including two of the real murder victims, Jay Sebring (Emile Hirsch) and Abigail Folger (Samantha Robinson) -- have been out to dinner and are settling in at the house on Cielo Drive to sleep off their drinks. Rick, who discovered a few months prior that he lived right next door to the Tate-Polanski rented residence, is chilling in his pool, and Cliff decides to indulge in an acid-dipped cigarette and walk his dog.
It's then that Tex (otherwise known as Tex Watson, played by Austin Butler) drives up with three Manson girls in his car, preparing to do the deed that "Charlie" bid them: kill everyone in the house on Cielo Drive that Manson's former friend used to live in, and make it "witchy." They thump up to the cul-de-sac, their car spewing fumes out of its exhaust pipe, and Rick immediately emerges from his house and shouts them down, telling them to take their loud car and get outta there or he'll call the police. Tex turns them around and slides back down the road, parking behind a hedge so they can chat.
The four of them quickly realize that the angry man was none other than Rick Dalton, former Bounty Law star, and one of the girls, Sadie -- interestingly, the Manson girls' names have been changed to Sadie (Mikey Madison), Katie (Madison Beaty), and Flower Child (Maya Hawke) -- suggests that they go to his house and murder him instead, after a long-winded stream-of-consciousness rant that boils down to, "TV stars taught us what blood and gore looks like, so let's mess them up for doing that."