What it got wrong
Here’s where we’ll get a bit nitpicky. First of all, Kai tells his followers that the killings happened on August 8, 1969, but since they occurred after midnight, it was technically August 9. And though not necessarily an error, he seems to insinuate that Atkins’ son, Zezozose, was hers with Manson; Zezozose was actually fathered by a man named Bruce White, andManson just named him.
The most glaring error in the episode comes in Kai’s comments about Patricia Krenwinkel. He mentions that she was picked up as a hitchhiker by Beach Boys drummer Dennis Wilson, who took her and the Family in but kicked them out after one night. Wilson did, indeed, pick up Krenwinkel, but his involvement with the Family lasted far longer than one night. In fact, Wilson’s relationship with Manson is how he came to know about the house at 10050 Cielo Drive, making Wilson a key player in the eventual murders.
As we already mentioned, Charles Manson was a musician, and wrote a number of songs, many of which were recorded and still survive on YouTube and Spotify. After Wilson picked up Krenwinkel and another Family member in 1968, they invited Manson and several other members into his home, where they lived for several months. Wilson was fascinated with Manson, and so impressed with his songwriting talents that he recorded one of his songs, "Cease to Exist," with the Beach Boys. It was later renamed "Never Learn Not to Love" and was credited solely to Wilson, which infuriated Manson, who threatened violent retaliation.
Wilson eventually severed ties with the Family, but not before introducing Manson to Terry Melcher. Melcher’s disinterest in Manson’s music is believed by many to be the motivation behind the Tate murders. According to Atkins, "The reason Charlie picked the [Cielo Drive] house was to instill fear into Terry Melcher because Terry had given his word on a few things and never came through with them." Tex Watson confirmed this, saying that Manson told him to "go to that house where Melcher used to live" and "totally destroy everyone in that house, as gruesome as you can."
That’s the big one, but there are a few other inconsistencies. For instance, before they killed anyone in the house, Watson made Tate, Folger, and Jay Sebring lie on their stomachs in front of the fireplace. Sebring, upset that this put a very-pregnant Tate in an uncomfortable position, argued with Watson, and was shot for it. The episode also shows Watson shoot Wojciech Frykowski as he attempts to escape, when in reality Watson tackled him and beat him with the end of a revolver before he shot and stabbed him to death. Additionally, Kai says Folger’s final words were "I give up, you’ve got me," when Krenwinkel has said her actual last words were, "I’m already dead."
The final error is actually a debatable one. The episode shows Atkins stabbing Tate to death, with a little help from Watson. In real life, it was Atkins taking credit for Tate’s murder while she was in jail for a separate offense that gave police their first clue of the Family’s involvement in the crime. But Atkins later refuted that claim, insisting that though she bragged to Tate that she had no sympathy for her, she couldn’t bring herself to kill her. Watson backed this up, admitting in his 1978 autobiography, Will You Die For Me?, that he was the only person to stab Tate.