Hedges and fences not looking right
The issue with fences and hedges not overlapping correctly is not isolated. You can have too fences connected and if you put a troff or anything center next to the two, the troff will be behind the first fence but in front of the second.
I believe this is because of the poor collision detection being used for this isometric game design. If zynga every figures it out, i'd love to know how. I have had similar problems with isometric games I have made. I either the collision box is too large or to small for these types of games.