My list of bugs:

Death Knight:
Corpse explosion, army of the dead and raise dead do not work. death strike doesn't heal you like it's supposed to.
Death and decay does almost no dmg.

Death knights start out with no mount, and no bags.

Hunter:
Tame pet is buggy and feed pet does not work.
volley's dmg is too low.

Rogue:
While grouped on my rogue, my combo points will be removed from the mob and put onto my group mate (same faction) And I will start to hit them instead of the mob or boss.

Killing spree does not work.

I'll add more as I find them!
Sorry about the format, I'm sure I'm supposed to follow some sort of template.

Rogue: fleet footed and camouflage do not increase walking and stealth speed like they should.

The energy regen talets like Combat potency, do not regen energy.

Poisons seem to get resisted quite often. I dont know if it's because they're level 80?

Thanks for taking the time to report some bugs. Very helpful!

Thanks black, I'm starting a shaman now, so we'll see what bugs there are in that class.

First observation is call of the elements (I think that's the name) the totem that drops all 4 totems at once, isn't in the game.

Also totems that do dmg like the fire ones, dont work properly.

Totem of wrath and flametongue totem don't drop at all.

Ya know what, lets just say none of the totems work, since I can only get the air totems to drop, not that they actually work when they do drop though...

Elemental mastery does not make the next spell instant cast.

Glyphs: You have to be exactly 80 to put in the last major glyph. even after 80 it takes away the icon in that spot, so I'm not sure if it still even works.