Noticed things like this here and there. http://img.photobucket.com/albums/v479/LordBlade/DoD%20Glitches/Glitch01.jpg
This just doesn't come off as normal to me lol - http://i1233.photobucket.com/albums/ff388/Novenari/GraphicalGlitchDredmor.png?t=1310841875 Sorry if it's small and hard to see, dunno why it shrunk so much...
In level 10, there are light brown squares on the floor, neat decorations of sorts. I don't have a save I can load for a picture, but when you walk from the top or left of them onto that tile, the square will hover above your character while you're moving.
I really wish there is an option to make the walls that cover half of you see through. Incredibly annoying. And i have seen the corner glitches like you posted.