Fridge Horror: In the final episode, it is hinted that the squibbons will eventually become sentient and build a civilization. Cthulhu or Mind Flayers, anyone?
And the last shot of that episode is a closeup of the Sun. Guess what happens later on.
Fridge Logic: Some of the evolutionary roads are a bit strange. The Ocean Phantom is a descendant of the Portuguese Man-O-War, which itself is a composite creature, meaning each creature making up the Man-O-War evolved together into the Phantom. And some species and even entire families that are well-known for their ability to adapt, like bats and rodents, just up and die out completely for no rational reason.
They explain why mammals die out. The world grows more and more warm and humid, conditions where mammals are at a disadvantage against birds and reptiles. Yes, we are in the Age of Mammals, but Earth also went through an Age of Trilobites once so...
Also: how do the bumblebeetles mate? They only live for a day, and as far as can be told they do not have some special mating ceremony like, say, california squid.
According to the book, they're sexually mature and mate as larvae ("grimworms").
The Deathbottle spreads its seeds by luring Bumblebeetles into its inner cavity, where the seeds stick onto the insect. It does so by imitating a dead Flish. But earlier on, the program made it clear that Bumblebeetles don't even crawl into real Flish carcasses either; they just land on them, and it's the larvae that dig themselves into the meat.