My hero got stuck in the walls 3 times in the Barracks area (first level). The first time was very funny. He was all the way outside of the mapped area and in the black void around it. So I walked around the outside of the whole Barracks and mapped it out for a self-impossed spoiler.
Also found that if you kill enemies at doorways (crowd control technique) some items will drop inside the walls and cannot be reached. This would be bad if a key was the item that you can't reach.
Also, if you decide to use a barrel or a chest as temporary storage be very careful. As the barrel or chest fills up items will disappear off the right side of the window and cannot be retrieved.
