Well i was surprised at the amount of easter eggs and secret codes black ops has so i decided to make a thread about them...They rely heavily on content taken from youtube. well here you go.
1)Call of duty code
2)Coded number squence
3)In a mission where you escape prison there are steps and this goes along with the zombie maps.
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The person who wrote this had very bad hand writing (worst than mines but i fix some of his errors)
4)Kino Der toten
-There are picture frames corresponding to the characters and if you press reload on them you get a message.
-Meatorite (3 of them and you get a song played like most zombie maps)
Video covers most of them.
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5)Five
-Phones -> musical easter eggs
4)Accesion
-Teddy bears ->musical easter egg
-Dolls; you see dolls that look like the charaters and they give speech
-5 nodes, video gives detailed explanation
5)Call of the dead
http://www.youtube.com/user/NGTZombies (Videos labeled Call of dead Easter eggs)
None.
-raindance and sacrificing your firstborn. If that sounds like too much effort, just use www.scmscx.com