Spoiler alert! This story will include spoilers for the final season of "Stranger Things."

No, there's no secret bonus episode of "Stranger Things" coming. But a new documentary has revealed some surprising behind-the-scenes secrets about the Netflix hit's final season.

"One Last Adventure: The Making of Stranger Things 5," now streaming on Netflix, dives deep into production of the show's fifth season, which recently concluded on a divisive note. The finale left some fans wanting more, so much so that a conspiracy theory arose that claimed another, surprise episode was on the way.

The documentary should put those theories to rest once and for all, and it also provides no evidence to support the other fan conspiracy that major scenes were cut out of Season 5. But it does include juicy new tidbits about how the ending came together.

Here's everything we learned.