This is just an aesthetic concern and obviously very low priority, but I notice that there are a lot of carpets and the like in the module that flicker constantly in the game client. The solution to this problem is to raise the placeable height by 1 pixel in the Toolset. That stops the flickering and it is completely undetectable to the player.
Yes, but which ones?
As kotenku said. This is usually matter of colliding assets, so simply moving them a bit works. If we don't have any idea which ones, from the THOUSANDS that we have, then it will be bit hard to find them :)