(most of these are season 1, I'm not caught up on season 2 lore)
S1 Gem and fWhip were both born human. They each chose different paths to gain power regardless: Gem chose wizardry and fWhip chose to be an artificer/alchemist. Part of the reason he moved to the Grimlands from the Crystal Cliffs is because of the corruption there (not the Xornoth corruption). It fascinated him. Eventually, prolonged exposure to it changed him. Like how in cannon, the corruption gave him real dragon wings to replace his mechanical wings, but I think it also turned him into a vampire.
This one is pretty vague but I think the floating islands of Stratos might have something to do with the floating islands in The Overgrown or the ones Wizard Gem fled to.
IDK if this is cannon but the lines from where water level changed that you can see at the Pix's archaeological dig are from when the ocean drained.
Sheriff Jimmy, Princess Katherine, and Princess Gem were childhood friends (I stole this from a YouTube comment)
Apollo (Gem's s2 bear) is a reincarnation of her X Life bear, Blue. This would fit with the cannon fact that she brought the season 1 dragons over from a previous world she'd lived in.
In season 1, Scott felt particularly protective of Shrub because he felt guilty for her home being destroyed (even though he literally did not cause it and could not have stopped it, he's just like that). That's why he didn't get too mad when she stole the Xornoth crystal. The reason he gave her those boots in the first episode was because he could sense that she had been near his brother, even though he didn't know that was what was happening.
In season 2, Pix, Gem, and Joel always knew about Lizzie being a cat. Pix and Gem because they know none of this is real, and Joel because he's her husband so of course he'd know
