We've gotten the nearly impossible stuff out of the way. With our helpful videos and screens, you should have no trouble discovering the rest of these 21 Easter Eggs for yourself. Starting at the beginning of the game...
EASTER EGG #4 - Master Chief's Ancestors?
The last thing we expected to stumble across in a science fiction epic full of aliens, cyborgs, spaceships and AI constructs was a hairy, knuckle-dragging family of prehistoric cavemen holding teddy bears. Yet here they are... and here's how to locate them in the first mission, Sierra 117. Shoot those creepy, frozen-faced Neanderthals in the face for us, won't you?