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• Three teddy bears holding sickles are located around the map, a song called "Abracadavre " by Elena Siegman (Remember to hold Use/Reload while your cross-hairs are on them to "find" them).
  

The first teddy bear is in the Centrifuge Room. When you go up the stairs, right and on the end of that walkway is the first bear.
The second teddy bear is behind a gate on the left, nearby the lunar lander with the claymore in the area.
The last teddy bear is nearby the "Speed Cola lunar lander", past the Speed Cola, when you have the wall in front of you. Turn right and on top of the wall there is the last teddy bear.

• There are Matryoshka Dolls of the characters scattered around the level. They will say something to the player when Use/Reload is pressed depending on who the player is.
  

Tank's Doll is in the lander room beside the Stamin-Up Machine. Where you walk through the door he is on the flaming barrels on the left.
Nikolai's Doll is on the top of the shelf directly to the left of the Speed Cola Machine.
Takeo's Doll is on the shelf directly to the left of the PhD Flopper Machine.
Richtofen's Doll is on the floor below the power switch. It is on the table to the left of the door leading outside.

• A small easter egg is in the room below the area where the Mystery Box and Power Switch are located. If the player goes towards the damaged windows, turns left and looks at the table, there will be papers, a black binder, two other binders in the back, and a Matryoshka Doll. If the player aims their cross-hairs at the black binder in front of them, there will be an alien like voice and their character will respond to it in a way, sometimes with the information about their past.
  

• There is a red telephone similar to the ones in 'Five.' It is next to the mystery box spawn, in the room next to the power; A second can be found where the players first begin on the wall to the left looking at the Lunar Lander; A third can be found just to the right of the PHD Flopper Machine; there may be more. (Note: it is unconfirmed what makes these phones rings, the second was found ringing after power, platforms, radio about black hole grenade and rocket have all been activated, but have not been able to duplicate).
  

• A pair of car batteries found underneath a stairwell in the centrifuge/spawn room have "ЅРДЯКУ" written across the front. *When you launch the rocket, if you make your way to an area where you can physically shoot the rocket, you can blow it up by shooting the rocket with a Ray Gun as it launches. *If you look at the second panel in the loading screen, the shadow of the rockets say "115"
  

Sorry for being a troll, but havn't you just copy and pasted these from the Call of Duty Wiki?

There is another one that if you throw a gersch device at a sort of refridgerator your character will say something.

wHO'S GONNA FIND THE OTHER TWO