Alright, I'll put the ones I've seen/experienced in here, they're mostly "Other" anyway.
Disclaimer: My GPU is a 8800GTX (XFX - 768 factory OC variant), which is very dated. Some of these bugs may be the result of old hardware.
1. Possible shader bug, at times sandbag or ground textures become "flurried", for lack of a better word. Imagine something breaking up into molecules but the molecules are still visible. As for the ground textures, this has happened on Apartments. The best way to describe it is that a building "continues down into the ground", or the ground has become partly see-through. All that is visible is a blackish "flurried" square shape. Will provide a screenshot if I can spot it again. This one is random and nothing specific has happened when I experience it.
Screenshot aquired, now trying to figure out how to make it visible on steam, or download the bloody thing so I can upload it on mediafire.
2. Sound bug. Twice now, all sound has stopped while being in-game. No specific action seems to have brought this on, and I am unable to reproduce it, so I'll have to label this as Random. I am using integrated sound (RealTek), this could be the reason; old motherboard and badly coded drivers.
3. Character animation bug. At times I have seen character models behave very oddly, going from standing to prone and back to standing a couple of times in less than half a second. Unable to reproduce since it only happens to people I am observing. Might possibly be related to trying to go prone or crawling prone into a place where you cannot prone.
4. MG turned invisible. FallenFighters, the one-life game mode. Soviet side, as attacker. Went out from the spawn and took cover to the left, to cover the left (as seen from attacker spawn) corner of the first objective. I un-sighted and scrolled to my pistol, pulled it out to advance towards the building and started sprinting. This was when the "pull out pistol" animation stopped and went back to the characters arms holding the mg, but without any visible mg on the screen. Scrolling to and selecting the pistol again solved it. Will try to reproduce.
5. Have had a few random crashes, could not upload the dump files due to size limit on the forum, so here is a mediafire link to the latest 4 (I have others but most are from the browser crash and no longer of use), winrar set the name to Logs.rar but it's the dump files.
http://www.mediafire.com/?ie4l20202mkskcs
Happy bug-hunting and hope this was of some help.
Edit: Two more random crash logs, I disabled Bloom and Light Shafts and tried to join a server, which led to these two crashes. Might be outdated hardware. Logs:
http://www.mediafire.com/?jbb1a3803cymtp5 (in zip this time / Logs.zip)
That's all I can think of right now. Will post more if I find anything.