Just as in Operation Flashpoint CWC and Resistance, there are quite a few Easter Eggs to be found in Armed Assault.
The Easter Eggs known so far have been discussed in this forum topic .
If you think those things are too subtle too be referenced in the WiKi, please do not read on.
The OFP Easter Eggs are described here 
Santa in the Chimney
As a runner up to OFP's most famous easter egg, many users reported BIS to have added this face in the chimney (visible all year long).
Ghosthouse face in the wall
Although quite fitting within the decrepit and derelict state of the house, the origin of this gimmick is still up for suggestions.
Notice the brand of the car too. [Screenshot credits to user Redface]
class Civil_Undead_2: Civil_Undead_1
Abridged Brand Names
Armed Assault is suspected to sport quite a large range of customized brand names, such as S(c)h(n)ell spotted by user Aimpoint in the Combat Photography Thread.
The news guy's button is a smiley face.
Reported by user teaser in the most comprehensive Easter Eggs thread to date.