This is a list of things I've done and run into, some I felt should have worked but didn't, others shouldn't have worked but did still others just seem broken.
To start, reading books breaks Invisibility
Pickpocketing appears to have no consequences.
Stealth checks only happen against line of sight. It is effectively perfect unless they can actually see you. I was able to completely bypass the fight with the Hag because the interaction wouldn't trigger while sneaking. I then accidentally triggered the cutscene with my imp, but she was looking in the wrong direction and still didn't start the fight.
Touch spells can't be cast through familiar.
I got into a fight with the group that survived the gnolls. I managed to close the side door and put a crate in front of it to block the door, it did not block the door. They were able to open the door and then climbed over the crate. I was also then able to attack through the door while it was open but between two characters.
Every little thing breaks concentration, automatically, it doesn't feel like there is even a roll, it just happens.
Movement is constantly ridiculous. Having to constantly ungroup and regroup is a pain when I just want one person to do the thing they do, but I want everyone else to stay put. Constantly I will move one person and cause someone else to move to a location that sets off a trap, or puts them in harms way. They appear incapable of attempting to avoid it.
Shortbow and Longbow seem to have the same range.
I may add more in as I continue to explore the maps and try things.