Yea Lost used a lot of locations also used in fairyland, like the place where they dock the submarine, the fairyland house location is always in the background. In the making of, you can see the submarine dock.
I also remember when they told the story of Mr. Eko and it was supposed to be in Africa, they used a yellow shack like house. That same house can be seen as a shelter during the fairyland shooting for staff and equipment. Most likely because certain locations and areas are open for rent for shooting things.
