On the map fw_mountain_final (believe it was that one), I discovered that Red Team could build onto the floating square platform but Blu could not build on theirs. Both sides could build on the thin connecting wire.
Additionally, on Red it was possible to build right up next to the spawn rectangle, whereas on blu there was the prop intersects a no build zone error from a greater distance away.
It also appeared as though you could sit in the middle of the enemy's spawn zone and prevent them from getting the intel, although i'm not 100% abt that.