The whole sideways story about alternate Jack's relationship with his surprise son was thoroughly limp, despite my usual predilection for such storylines. It tells me nothing new about Jack and I doubt will have much effect on things back on the island.
Just about the only thing that did work for me was Jin's horror movie scenes at the hands of axe killer Claire. I'm not sure where they're going with that, but at least it was intense. My friend Michael figures the final scene means Christian Shephard's appearances on the island have always been the smoke monster guy, and I guess he's right. That would imply that Smokey led the castaways to fresh water and hung out in Jacob's cabin and had Locke move the island, which were things I'd been chalking up to Jacob. Interesting.