Jake hurts Finn in a playful fight, bringing back painful memories from his childhood. Unfortunately, this takes place right before Finn is captured by crystal marauders from another dimension.
- Affably Evil: For a bunch of ruthless mercenaries, the Crystal Guards are pretty friendly.
- Body Horror: Finn being transformed into a crystal.
- Call-Back: Continues the events following Tree Trunks eating the Crystal Gem Apple in "Tree Trunks".
- Continuity Nod: Jake's remark about being "hopped up on magical power", espeically with the Aside Glance he gives, seems to be a nod to the previous episode "Power Animal".
- Epiphany Therapy: After a vision of his dad reveals that Jake was destined to "hurt everyone who is evil", Jake remarks "Well, I'm over it now!"
- God Save Us from the Queen!: Queen Quartzion, AKA Tree Trunks, who's gone mad with power after eating the Crystal Gem Apple.
- If I Had a Nickel: Jake assures Tree Trunks "If I had a penny for every time someone went crazy-hopped-up on magical energy, I'd be Abraham Lincoln!"
- Kick the Dog: Tree Trunks killing the otherwise loyal Crystal Guard.
- Mind Screwdriver: Explains, to a degree, the Gainax Ending of "Tree Trunks".
- Punch-Clock Villain: The Crystal guards aren't inherently malign, they're just doing their job.
- Sanity Slippage: Tree Trunks as the Crytal Queen.
- Sequel Episode: To "Tree Trunks", which explores on what happened to Tree Trunks after she ate the Crystal Gem Apple
- Suspiciously Specific Denial: Finn tries to reassure Jake after he injures Finn in a fight.Finn: You didn't mash my potatoes. You didn't even make me cry silently into my pillow for... (thoughtful pause) thirty minutes.
- Temporarily a Villain: The Monster of the Week turns out to be Tree Trunks, who goes back to her usual nice self after Jake makes her throw up the crystal that was giving her power.
- Violence Really Is the Answer: Jake's pacifism is completely pointless, and it turns out he misinterpreted his dad's comments.
- With Great Power Comes Great Insanity: Tree Trunks as the Crystal Queen is quite a lot less sane than usual, and much more malicious.
- Yandere: Tree Trunks as the Crystal Queen takes her crush on Finn up a notch, trying to force him to marry her.
- You Have Outlived Your Usefulness: Tree Trunks blasts the Crystal Guards after they've brought Finn to her. Making it worse is that she does it while they're in the middle of praising her.