I noticed a couple of bugs related to guards for the castle:
1.The Human guards you get from Summeredge provide their defense bonus and enable the defense bonus+guard training options from Felicia, but the guards never show up on the castle maps anywhere.
2.The Dwarven guards you get from Novos have the opposite problem, they show up on the map, but no defense bonus and no guard training enabled.
Oh and one other thing, I think the various CGs are packed up with the current version of the game. I don't see them in the img folder anywhere and yes I do have hidden folders set to be shown.