In the film, James Safechuck, now 40, and Wade Robson, 36, share graphic details of alleged sexual abuse and grooming by Jackson, whom they met when they were children, in the 1980s and early '90s.
Safechuck claims that Jackson often gave him jewelry, including a wedding ring.
"I was really into jewelry, and he would reward me with jewelry for doing sexual acts for him," said Safechuck, who added that the pair had a "mock wedding ceremony."
Safechuck also said Jackson would make him participate in "drills" where "he would pretend like somebody was coming in and you had to get dressed as fast as possible without making noise."
Robson said Jackson sexually abused him and told him that is "how we show love." The pop star allegedly swore him to secrecy, saying the two would "never be able to see each other again" if anyone discovered their relationship, Robson claimed.
Robson said Jackson eventually began to ignore him in favor of "Home Alone" star Macaulay Culkin.
"There was jealousy from me – hurt, confusion," Robson said.
2. Jackson's family has slammed the claims.
"We can't just stand by while this public lynching goes on, and the vulture tweeters and others who never met Michael go after him," his family said in a statement last month, according to Rolling Stone. "Michael is not here to defend himself; otherwise, these allegations would not have been made."
They also called Safechuck and Robson, who previously denied they were sexually abused by Jackson, as "opportunists."
"Michael Jackson was and always will be 100 percent innocent of these false allegations," the family said.
Read more here.
3. Jackson's estate is suing HBO and Time Warner for "damages potentially exceeding $100 million." The lawsuit, filed last month in Los Angeles Superior Court, claims that HBO is violating a "non-disparagement clause" in a 1992 agreement that allowed the network to broadcast a concert from Jackson's "Dangerous" tour, The Associated Press reported.
"HBO profited off the Dangerous World Tour by airing a concert from the tour and promoting Michael Jackson's talents," the lawsuit says. "Now, HBO is profiting off the Dangerous World Tour by airing a 'documentary' that falsely claims Michael Jackson was abusing children on the same tour. It is hard to imagine a more direct violation of the non-disparagement clause."
The lawsuit also points out that Jackson was acquitted of molestation charges in 2005.
"Nothing and no one can rewrite the facts which show that Michael Jackson is indeed innocent of the charges being levied at him by HBO in its 'documentary' 'Leaving Neverland,'" the lawsuit says. "No one-sided 'documentary' can substitute for a real documentary, or for a trial where both sides are heard, competent evidence is presented, and witnesses are cross-examined."
>> On Deadline.com: Read the court documents here
HBO said last month that it would still be airing the documentary "despite the desperate lengths taken to undermine the film."
"This will allow everyone the opportunity to assess the film and the claims in it for themselves," the network said, according to the AP.
4. The film has sparked debates on social media. As the first part of the documentary aired Sunday night, viewers flocked to Twitter to share their views with the trending hashtag #LeavingNeverland. Here's a sampling of what they had to say:
5. How can I watch the rest of the documentary? Part 2 of "Leaving Neverland" airs at 8 p.m. EST Monday on HBO. Subscribers also can view it using HBO Now or HBO Go.
After Monday's finale, an Oprah Winfrey-hosted special called "Oprah Winfrey Presents: After Neverland" will air at 10 p.m. EST.
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