I am legend:
Scattered throughout the island there is a magazine with a bald woman on it. It is the same woman Will Smith captured and experimented on. The only difference is that she had a cure in her and the cure in this game would be a nuclear explosion. (lol)

Crysis 2:
In the medical station, on the roof in the radio hit and the fast travel station is, when you walk through the door turn right towards the lockers and there will be a posting bored with a ad for "Chrome 2". This is a reference two the suit in Crysis 2.