This is a blog about the weird pop references ( and other stuff)  included in world of warcraft. The list would be endless so im gonna report the ones i found myself.
 
In Scholazar Basin there is a small piece of land inside a land with a hatch on it. You cant interact with it in any way and its not the subject of any quest in the area but if you point the mouse over it you will see the numbers of LOST +1. 
The mounts blood elves use are modeled after chocobos. Also a hair option for blood elves is the exact hairstyle of Sephiroth from FF VII.
The alliance workers that are lumbering wood in azuremyst island are the exact model of the human building unit in warcraft 3. They have the same voices as in warcraft 3 aswell. This is especially weird considering that before the first expansion there wasnt anything resembling them. 
There is a priest talent  in the Holy tree that allows them to take an angel-like form for 30 seconds after dieing allowing only healing spells . The tooltip says : You have grown more powerful than anyone can possibly imagine. This is something said by Obi-Wan in the original trilogy of Star Wars.
The raid boss C' Thun is named after the Lovecraftian old god Cthulhu.
 Most villains in Warcraft Lore began as heroes but went insane at some point. Most notable examples are Arthas, Illidan and Kael' thas. 
Night elves have no male guards while blood elves have no female guards.
There is a low level ring called : The one Ring. A reference to Lord of the Rings. At some point i found out ( cant remember how) that there is another ring called The 2 Ring.  It says 'better than the 1 ring' . Both rings can be used by players and have nothing intersting apart from being useful for low-level players.
There is a huge eye in Icecrown. It is on top of a tower just like the eye of Sauron. Another referance to LOTR. 
The last boss of the Ulduar raid is Ygg-Saron. Ygg-Saron like C' Thun is named after a Lovecraftian  god. He also shares the same traits (madness). The original god's name was Yog-Sothoth. 
If you go to the Caverns of Time instance called Old Hilsbrad you will find an area you can explore by your own that is basically the town of Southshore and the surrounding area. There you will find intersting characters. Kel' Thuzad, second to the Lich King appears, still human as member of the Kirin Tor after having contacted the Lich King (Ner' zul). This instance is set 7 years to the past, before even the events of Warcraft 3. Nathanos Blightcaller, a Horde undead quest giver in the Eastern Plaguelands and target of an alliance quest (his death specifically) appears as a human named Nathanos Marris. A fisherman tells his weird dreams to his friend and mentor. 
He sees Tarren Mill lost to the alliance, death, war,  undead walking around.... Basically in his dreams you understand that he has seen the future.
Kel' Thuzad has been killed 3 times and ressurected twice following his first two deaths. ( One in Warcraft 3, one in the original naxxramas) 
The Scarlet Crusade. ( abit spoilers here) Even though they oppose all undead and eventually everyone that is not withing their own ranks, they still have death knights in their ranks, which are essentially undead. The scarlet crusade's 2 leaders have BOTH been possessed by demons. The Scarlet Crusade leader was possessed by Balnazzar and the Scarlet Onslaught Admiral was possessed by Mal' Ganis. In general all lore conserning the scarlet crusade is plain weird, especially their open hostility to even members of the alliance. 
More to be added at some point in the future.
In Marshal's Refuge in Un'goro Crater are three characters that reference Nintendo characters:  Larion, Muigin, Linken.  Linken's epic quest starts in Un'goro too.  One of the final rewards is Linken's Boomerang. 
 Adam Eternum in Shattrath city is a reference to Adam (He-Man).  He is standing beside a "Battle Tiger" which is Battle Cat and a little gnome with a pointy hat which is supposed to reference Orko.     
In the sewers in Dalaran there is a rat surrounded by four turtles, so TMNT. 
 
I got another one! There are 2 scarlet crusade NPCs called Brother Crowley and Brother Anton. References to Alistair Crowley and Anton La Vey
 
added

Gotta love Blizzard and their references. Also, "The One Ring" goes up to 4 or even 6 if I remember correctly.
And you could not make this such a painful wall of text to read. Oh, and...

http://www.wowwiki.com/List_of_pop_culture_references_in_Warcraft
http://www.wowwiki.com/Easter_eggs

Just wanted to add a few to your list:
 
In the sewers in Dalaran there is a rat surrounded by four turtles, so TMNT.  
 
In Marshal's Refuge in Un'goro Crater are three characters that reference Nintendo characters:  Larion, Muigin, Linken.  Linken's epic quest starts in Un'goro too.  One of the final rewards is Linken's Boomerang. 
  
 Adam Eternum in Shattrath city is a reference to Adam (He-Man).  He is standing beside a "Battle Tiger" which is Battle Cat and a little gnome with a pointy hat which is supposed to reference Orko.     
 
Also, the Lost reference you mentioned is in  Sholazar Basin not Grizzly Hills unless there is another one I don't know about.