Easter Egg:

Undead Campaign: Chapter 1:
 In the main town area after you get your shade, there
are 2 civilians fighting with a large crowd watching. 
Named: Robert and Tyler. (from the movie Fight Club)  

Undead Campaign: Chapter 2:
After the cut scene in the middle where you find you 
need the urn, knock down the trees to the west of the 
green human base. When you bring a unit to the waterfall
you see a flash of a baby panda sitting on the shoulders
of another panda wearing a sword. It'll have the text
written: "SECRET FOUND Panderan Relaxation Area"