The winter scenes where they show the lake frozen, were not shot in the winter. They had to construct a winter scene by sinking cinder blocks into the pond and then covering it with plywood, before adding the "snow" topping. See more
You know, you've done some amazing things here, Sam. Hollowed out a whole little world for yourself. I bet there's not another boy in the whole civilized world who's done anything like it.
Yeah, but that's not why I came.
Why did you come, Sam?
Well, I came because I thought the only way to know nature was to live with it. Like Thoreau. You know? And I came because of my experiments. I learned all about algae under the conditions of nature. And I learned about survival. And... I learned about ...