I was slightly disappointed that they explained what Billy wanted to tell Finn. Or, at least, that it was done so soon. I feel like the more Adventure Time thing to do would have been to just leave it at "well, that's going to bother me forever" and then maybe tease it for a while. That he actually did find out in the same episode kind of undermines it in my opinion.
Granted it's an important piece of information and there are precious few ways to reveal it.
There was absolutely no way they couldn't tell us. As it was the season finale it was the perfect moment to reveal it. Also as it was the finale, it allows for a build-up over the course of the next season. Instead of finding out part way through and having to hurry and get it done.
Might be possible PB is some sort of amalgam of Betty and that pink goo that helped Simon and Marcy.
If that's the case, it sorta explains how IK is attracted to PB the most.
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"Farewell, Damos... Ash, Pikachu... And you. All of my beloved." -- Arceus
PB and Lich were involved in the Mushroom Bomb going off. There's the pink goo and the CN website saying she's half bubble gum, half human. Would explain the extreme scientific passion and the 'eternal kingdom' plan.
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"Gonna need more chloroform..."
"If you look down on us, judge us, condemn us... then you shall fear us!"
Also she's super old. So she's been around for a looooong time. Even long enough for Finn's past life to have known her. Which seemed to be a few hundred years ago at least.
Battle of the ancients, Maja's plan begins, New sword, elephant cliffhanger, and most curiously is what the heck happened to Finn. Side note, enjoyed the literature quality in this, though not sure why.
R.I.P [SPOILER - highlight to read]: Rootbeer guy
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"Gonna need more chloroform..."
"If you look down on us, judge us, condemn us... then you shall fear us!"