Left 4 Dead 2 (Xbox 360) Easter Eggs

When you have downloaded the new campaign "The Passing" you can view an easter egg referring to Dead Rising.
On the second level in the campaign you will reach a room where you must go up some stairs to proceed with the level.
Before you do you may... more

Once you enter the first saferoom and load the next chapter, look at the cereal boxes on the shelves. It advertises Team Fortress 2 collectibles. Though it only shows Heavy Weapons Guy.