Easter eggsedit
From WoWWiki
An Easter egg is an undocumented, obscure, or otherwise "hidden" command — usually buried deep within a program's source-code and only triggered by executing a certain series of actions or system commands. Often, an Easter egg will reveal an inside joke, though Easter eggs can also be placed into in-game props and scenery or only in areas visible to those that are actively using "cheat codes" (or otherwise circumventing the "normal" operation of the software).
While Easter eggs were once included in virtually all computer software, software companies such as Microsoft have discontinued the practice, citing security concerns associated with undocumented (and often untested) code.
For more hidden in-jokes and references, see in-jokes and references.
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Easter eggs in-game
These are mostly Blizzard-related Easter eggs.
See In-jokes and references for more.
Guards
Guards of cities will respond to some emotes such as /wave, /rude, /kiss, or /salute. This does not apply to all guards though, most notably Darnassus Sentinels do not reply to emotes and even the same guard will not always respond. However, if you ask a Darnassus Sentinel about the enchanting trainer, she may respond as if you said she was enchanting. Also, if a blood elf paladin /eye a Silvermoon Guard, they will /kneel.
Goblin Shredder display
If you look into the cockpit of a Goblin Shredder, you can see a picture of 
Kerrigan from Starcraft on the control panel.
Michel Koiter
At the Shrine of the Fallen Warrior, there is a memorial dedicated to an orc with the initials "M-K". M K was Michel Koiter, one half of Twincruiser, a Blizzard illustrator who passed away during the development of World of Warcraft. If you visit the memorial, you will find a spirit healer named Koiter. Most likely named in dedication for the once beloved man.
Mountaineer Pebblebitty
Players who are fed up with the rude female dwarf who presides over the quest chain to obtain the key to Searing Gorge, Mountaineer Pebblebitty in extreme southern Loch Modan, may feel inclined to use /rude on her after all the trouble she puts them through. Blizzard has anticipated this and provided an appropriate response.
Deeprun Tram sightings
When you are riding on the tram, when in the underwater area, you can sometimes see Nessy, a naga siren, a Deeprun Diver, a Basking Shark, or a Deeprun Chest.
Vanity pets
If you own a non-combat pet and stop moving for a while, it will begin to sleep or do other kinds of emotes.
- The Zergling pet will chomp at air.
- The Murky pet will sing and dance.
- The Mini-Diablo pet spouts out fire when he is idle.
- The Panda Cub and Sleepy Willy lie down and sleep (you see green Z Z Z ...) when idle.
- The Speedy pet will shout, scaring nearby critters.
- The Peanut pet will occasionally blow his nose, making a noticeable elephant noise.
- The Willy pet will occasionally kill nearby critters with an eye-beam.
- The Egbert pet will run around like a caffeinated two year old.
- The Pandaren Monk pet will respond to /bow and /drink emotes. Also, he will do... kung fu!
- The Core Hound Pup pet will howl, stand on its hind legs and bark, roll around, and dig up a bone.
- The Onyxian Whelpling pet will emote a deep breath, but fail and let out a plume of smoke.
- The Grunty pet will start to shoot his gun. If a Zergling pet is nearby, the two will battle until one pet dies (gets despawned).
- The Tyrael's Hilt summons Tyrael from the Diablo games. He responds to /dance emotes, and will sleep while floating in the air.
- The Perky Pug pet will occasionally drag his rear along the ground.
- The Stinker pet will chase any nearby Bombay Cat or Black Tabby pets and gain a heart above his head, before it breaks. The reference is from Pepé Le Pew.
Stratholme Spectral Citizens
If you type /dance on the civilian ghosts in Stratholme, they will respond in kind and dance with you. Even if you attack them, subsequently dancing with them will make them dance with you instead of continuing to attack you.
Also, appropriately, they will respond to the /rude emote with a rude action of their own.
Hidden Mickey Mouse
An exceptionally well hidden Mickey Mouse is located in the Valley of Honor within the Horde city of Orgrimmar, where the Hunter trainers are. It is so large, and so well sculpted into the surroundings, that most people will never know that it is there. The only way to see it is to manually increase the maximum zoom setting of the camera.
Fun graphics
Along the Webwinder Path, there are some felled trees. One end has a large smilie face on it.
There is also a large smiley face underneath Karazhan. You can see it if you log out near Karazhan. Once you log back in, before the doodads and NPCs load up, you can see the smiley face. Humans can get under Karazhan to the smilie face by jumping to a certain ditch in the corner of the rubble in the back side of Karazhan (facing the crypt/graveyard).
In Searing Gorge, if you head just a little north of Blackchar Cave and zoom your mini-compass all the way out, you can see a smiley face in it.
When floating underwater, one of the motes that float by will very occasionally be a tiny smiley face.
In Stranglethorn Vale, the vines on trees look like orc faces, or possibly, the Great Deku Tree from Zelda.
Lost
There is a small island in the Bittertide Lake in Sholazar Basin with a door and a handle, on which there is a plaque that reads "5 9 16 17 24 43". It's a reference to the sequence of numbers "4 8 15 16 23 42" from the show Lost.
Help
Northeast of Thunder Bluff on top of a mountain is a line of text that reads "HERB", but at another look you will see that it says "HELP" backwards.
