The longest episode of the series with a length of 44 minutes.
In one of the original scripts to this episode, GOLB was going to speak and be voiced by Tony Todd, as well as explain more of his relationship with The Lich.
In honor of the series finale, Cartoon Network aired an all day marathon leading up to the last episode.
The show is set to continue in comic book form called "Adventure Time: Season 11" that will take place after this episode and explain stuff that wasn't explained more in the show and was missing, including how the future of Ooo came to be with Beth and Shermy being in there. There will even be a comic book mini-series spin-off called "Adventure Time: Marcy and Simon" which will also tell what Marceline and Simon's futures will be like.
According to animator Steve Wolfhard on his Twitter account in his original script for this episode that were one of the original scripts to the episode. There was going another epilogue in where Jake becomes an old dog and dies. Then his funeral is at the candy kingdom where Princess Bubblegum, Marceline, BMO, Sweet Pea as a teenager, Mr. Pig, Treetrunks, Lady Rainicorn, Jake and Rainicorn's kids and grandchildren and some candy citizens appear for his funeral while his body becomes big and uncontrollable that cause the guests to get out unharmed while the candy kingdom is destroyed from it. Latter Princess Bubblegum in a ship grabs Jake's really big body and puts it in the ocean where it drifts to the missing chunk of the earth from the Mushroom War where it fills that entire chuck and years latter becomes a new continent for earth. However the heads of Cartoon Network decided not to put it in the final print of the episode and found that it would be better if the viewers would think what their own thoughts of what Finn and Jake's futures will be like to them.