There's also the Minotaur battle. When its HP reaches 0, it threatens to cast the almighty Holy. Except, well, it has no MP to use it.
"Bartz, Bartz, Bartz... so enthusiastic and yet so stupid."
When you fight Azulmagia the Blue Mage, you will notice that there are a few Blue Magic spells that he does not know. If you use one of these spells against him, he'll learn it and immediately use it against you. This even includes Self-Destruct.
"It is time for your viscera to see the light of day!"
Description for the Dancer class: "Fighters whose smooth moves confuse enemies, leaving blood on the dance floor."
(Upon learning his chocobo is a ladies' man) "Slick!"
"You've mastered the piano!!! Others quake in fear at your superhuman keyboard manipulation skills!"
When your party falls down into the ruins in the First World and Galuf gets trapped in a little side area. Figuring they'll catch up with him later, the party starts to leave, and Galuf panics.
Speaking of Galuf, when he regains his memories, he jumps, causing the question mark bubble over his head to hop off.
After Galuf's ill conceived plan to steal a pirate ship backfires, you get this:
Galuf: Whose boneheaded idea was it to steal a pirate ship anyway?
Bartz: Look in the mirror, pops.
Galuf: Ohh, my aching head. I can't remember a thing.
Bartz: And your amnesia oh so conveniently returns.
Krile's Berserker outfit. Bartz's, Galuf's, and Faris's Berserker outfits actually look like they're wearing wolf/cat (for Faris) fur, while Lenna's is basically a swimsuit with a tiger pattern. Krile's outfit? A "disguise pajama" (according to the FFWiki).
Returning to Tycoon Castle after Castle Exdeath gives us this little gem: