You have to hand it to Blizzard. They have a way with pop culture references and inside jokes. One of the methods that developers use to express their sense of humour is in their naming of the various NPCs in the game.
For instance, the two Triumphant Armor vendors located outside Crusader's Coliseum. Champion Isimode (which I'm going to pronounce as "easy mode") is the vendor for the Alliance players, while Champion Faesrol (or "face roll") is the vendor for Horde players.
Harrison Jones guided us through the introductory parts of Zul'Aman (or at least, tried to). Unlike the real Indiana Jones, Harrison didn't didn't last very long after your raid hit the gong. He'd end up resurfacing again in an escort quest in Grizzly Hills (aptly named Dun-da-Dun-tah!).
Firefly loves might have missed this NPC over in Zangarmarsh. The engineering Grandmaster K. Lee Smallfry is a nod to Kaylee Frye who is the engineer on the television series.
Last but not least, a few Goblin NPCs are named after a few prominent Star Trek characters. In Booty Bay, there's a goblin named Scooty (Scotty)! The first time I ran Gnomeregan as a Horde player, I came through here and did a double take on the name. You could imagine my pleasant surprise when I activated the transporter only to emerge on the other side to be greeted by Sprock (Spock).
Which NPCs have you run across that have caused you to look twice?