These are the things I noticed while putting together CoD but some may not be actual bugs.
Silence doesn't stop you starting to cast if your standing next to the target.
You can backstab in a different round (maybe right but not the same as CotAB).
You see three doors/fireplaces/whatever at a certain distance away.
You can train in other classes if you do it at the same time as the permitted ones.
If you change designs you have to go through all the monsters in the editor before the icons change.
You can backstab with any weapon, even without a weapon.
You can be backstabbed even if you haven't been attacked, if you've shot I think.
In overland execute event at destination works when testing but not in the game.
Scroll of prot dragon breath acted just like leather armour +1 whenever I gave the mage bracers.
Left over attacks from darts of hornets nests can be used in melee.
They memorise when they regain consciousness as if they'd been awake.
Ammo gets unreadied when you get new ones.
Paladins and rangers can't wear leather armour, fighters can.
I had a bug where training cost double what it should apart from 200 which became 333, but that might just be in testing mode.
The combat icon for the character at the top of list is sometimes invisible, I think just when you're outside and there's the maximum amount of enemies.
Nacacia is a chaotic good thief, but I think the mistake is that thieves can be lawful neutral/evil instead of chaotic good.
Grunschka should have constitution 19 bonus, Krondasz should have dwarf magic resistance bonus and Storm should have both.
And some monsters (like goblins and kobolds) can't use their weapons unless you give them a class.