Estos son los npc que encontré que no reaccionan cuando les hablas:
http://cata.openwow.com/npc=16499
http://cata.openwow.com/npc=16503
http://cata.openwow.com/npc=17089
http://cata.openwow.com/npc=16500
http://cata.openwow.com/npc=16502
http://cata.openwow.com/npc=16501
http://cata.openwow.com/npc=17101
http://cata.openwow.com/npc=18038
http://cata.openwow.com/npc=17214
http://cata.openwow.com/npc=17215
http://cata.openwow.com/npc=17222
http://cata.openwow.com/npc=17212
http://cata.openwow.com/npc=17483
http://cata.openwow.com/npc=16553
http://cata.openwow.com/npc=17482
http://cata.openwow.com/npc=17481
http://cata.openwow.com/npc=17480
http://cata.openwow.com/npc=17555
http://cata.openwow.com/npc=20914
http://cata.openwow.com/npc=17584
http://cata.openwow.com/npc=37798
http://cata.openwow.com/npc=29712
http://cata.openwow.com/npc=37063
http://cata.openwow.com/npc=352
http://cata.openwow.com/npc=43819
http://cata.openwow.com/npc=43822
http://cata.openwow.com/npc=6740
http://cata.openwow.com/npc=1275
http://cata.openwow.com/npc=1257
http://cata.openwow.com/npc=1432
http://cata.openwow.com/npc=11867
http://cata.openwow.com/npc=1289
http://cata.openwow.com/npc=1287
http://cata.openwow.com/npc=1573
http://cata.openwow.com/npc=16734
http://cata.openwow.com/npc=7955
http://cata.openwow.com/npc=1571
http://cata.openwow.com/npc=4321
http://cata.openwow.com/npc=40358
http://cata.openwow.com/npc=23995
http://cata.openwow.com/npc=7763
http://cata.openwow.com/npc=8125
http://cata.openwow.com/npc=39034
http://cata.openwow.com/npc=9619
Hay mas, iré agregando conforme los encuentre.
Si alguien quiere agregar, por favor háganlo con el link del npc.