1) A Half-Dragon worshipping Tikki Tooki, with Tikki Tooki's Dodge Boon (+10%), can attack a damageless magic-immune plant endlessly in order to acquire an endless supply of piety - provided they never knock the plant into a wall or enemy.
2) Half-Dragons still earn Specialist (defeat the final boss using only one type of damage), even after executing a melee attack that deals both regular (magical) and knockback (physical) damage. I believe it's currently impossible for a Half-Dragon to *not* get Specialist, unless they use Pisorf. I'm guessing what's happening here is that a Half-Dragon's Knockback is still being considered "typeless damage".
3) After defeating the Prince in Naga City, if you talk to the mysterious Hooded Figure before exiting to the Victory Screen, they'll say the same thing they did when you entered the arena. For flavor-text purposes, I was hoping they'd comment on my victory. :3
4) The Martyr Wraps' description says "globally corrodes on level-up", but it only corrodes already-revealed enemies (as well as yourself). Also, I'm not sure if it corrodes already-revealed enemies on a different dungeon level.