Desk and Chair from I Am Legen at the end of a pier: X: 18207, Y: 21543
Hot Air Balloon (Fly by shooting off sandbags, hitting Y rapidly and moving in directions by walking): X: 7392, Y: 16151
Field for flying plane (It's a field in the jungle perfect for the BM plane, meaning you can practice using it. This way it goes off the ground without exploding! Also, its right by a village, so you can extract there anytime) : X: 29963, Y: 17120
Hatch from LOST: X: 1769, Y: 4351
Beached Whale: X: 29611, Y: 31332 (You can make It's stomach explode by grenadine It's stomach. Very gory.
LOST island plane crash wreckage and search sign: X: 1275 Y: 3663
3 Faces: X: 30377 Y: 30638 (I don't really think this is a easter egg, but whatever)
Skull Island: X:14834, Y:17323 (once again, not really an easter egg, but still cool)
A shark fin swiming, but a metal thin attached to a propeller: X: 12730 Y: 22494