Why an Easy Prey monster would ever aggro you. I know the really low-end Easy Prey monsters don't, but you'd technically con "Very Tough" to them.
Why sitting garners the same reaction from monsters as resting. Even a Too Weak monster will aggro you if you sit within visible range.
Why magic and job abilities (especially the really loud ones) don't cause sound aggro.
Why there's a little girl in the game so obsessed with panties.
Why I can't wear a hairpin along with a hat.
Why I can't wear socks with shoes or wristbands with gloves.
How Tarutaru have babies (seriously, even their youngest children are almost as big as adults -- how the hell does it work??).
Why they would give the coolest battle stance in the game to a weapon in which the only job that can equip it can Dual Wield starting at Lv.10. (Seriously, I wish the one-handed Katana battle stance could be used more)
Why a stealthy job like Thief or Ninja gets bright green AF and bright orange relic respectively.
Why Square-Enix would allow players as low level as 30 into Abyssea. It should have been 75+.