Hello,
I am playing this game right now and I'm almost finished with it. I did find some bugs that I think you should know.
For the skills and magic, if a character achieves their Ultima skills, they will suddenly get a copy of all their LV 1 abilities if those abilities are at levels 2-3. I'm not sure if this is a bug, but I believe it's worth checking out.
In the second Ernest quest, after you complete the Evil Office part, if you go back there again, Ernest will be there again. Talking to him again will add another towards the sidequest counter but I don't think that was supposed to happen.
I'm looking forward to the ending. Now I'm just training all my characters to achieve their Ultimas.