Noticed that destroying the exit to the tutorial cave (the one north of Junius and Bibius) destroys the door and leaves just bare rock behind it, instead of letting you access the dungeon from the other side.
e: Also, it's pretty easy when bashing open doors to use Staff of Magus, as it doesn't deteriorate your staff and there's almost no cooldown.
e2: Also found some graphical artifacts in the steam that now appears when you put out fire.
Does steam ever dissipate on its own? Never mind, it did while I was tabbed away, typing this post.
http://i58.tinypic.com/2nvwd39.jpg 
