[telsamat]

At first all data are taken from http://www.wowwiki.com/Death_knight_quests

because wowhead has false data sometimes

12849 Power of Blood, Frost And Unholy - can be turned in right after Might Of the Scourge. Should be available as a side quest to The Will Of The Lich King

UPDATE quest_template` SET `PrevQuestId` = '12714' WHERE `Id` =12849;

12701 Massacre At Light's Point - While in a mine cart, NPC Scarlet Fleet Defender remains hostile and still attacks. Player can't get to the ships because he is killed in the mine cart.

12720 How To Win Friends And Influence Enemies - While hitting with daggers (http://www.wowhead.com/item=39371), they don't make NPCs surrender = quest can't be completed .

12717 Noth's Special Brew - can be picked up and completed only after How To Win Friends And Influence Enemies 12720, but should be available after 12716 (The Plaguebringers Request)
http://www.wowhead.com/search?q=A+Special+Surprise
According to Wowhead, some of these quests are for two races, however that is a wowhead glitch. Currently, for example taurens have two quests avalaible for them, but should have only one.
http://www.wowhead.com/quest=13166
All, except few NPCs required for this Q are dead.

http://www.wowhead.com/npc=31098
http://www.wowhead.com/npc=31096

UPDATE `creature_template_addon` SET `auras` = '' WHERE `creature_template_addon` =31098;

for 31096 I dont know where is a problem

http://www.wowhead.com/quest=13189
This NPC http://www.wowhead.com/npc=39605 is not spawned in the correct phase of Orgrimmar. Quest can't be turned in.