Linux graphics glitches

[thesource]

I 'm not sure if these are known bugs, but just in case. I noticed some graphical glitches during my latest playthrough (a couple of days ago):
1. Coach Oleander on-wall animation during basic braining doesn't work. There's only a wall texture where his face should be. For example at the very beginning where you must punch him in order to proceed.
2. During the fight with Kochamara his "tangle beam" attack is invisible. He moves to release a beam and something is really reflected back from my shield, but beam itself is not drawn.
3. Water texture is drawn with glitches at some angles (bad lighting?)
4. Enabling shadows in graphics settings hits performance very hard, though no visible changes occur.

P.S. Tested on GeForce GTX 460M with 304.88 drivers (fedora 18 64bit)

[Aoi Blue]

Same issues with an ATI card, except no performance hit from shadows, only no visible change.

[flesk]

The first one has been mentioned several times over at the Double Fine forums, so I think they're aware of it. It also affects similar effects in their more recent game the Cave. I specifically remember it from the Adventurer level there.