[spoiler:2qqy8u2d]The main thing that surprised me was that the DHARMA Initiative used Room 23 to experiment on kidnapped Others! No wonder the DI were wiped out! I can't imagine Richard let alone Charles Merciless Widmore would approve of their people being kidnapped and brainwashed by scientists they merely allowed to stay on the island.
This also explains the cryptic "God loves you as He loved Jacob" reference in the Room 23 video, which back then led a lot of viewers to believe that the video was made by The Others after the purge of the DI in 1992. I like this new explanation, that it was a way of probing the brainwashed minds for information about Jacob, so much better.
The polar bears didn't need explaining (it was obvious ever since Charlotte found the bear skeleton in Tunisia), but since they explained the pregnancy issue with the bears it was welcome anyway.
Also, if Ben knew about the Hydra video all along, does this mean that he knew that the pregnancy issue was impossible to solve and thus just used this to keep Juliet on the island? If so, that makes Ben's plan for Juliet even more evil than I originally thought. Not just because he knew she could never solve it, but also because he let several women die when they could have left the island to give birth. OR (far-fetched theory up ahead) Ben knew - from seeing Juliet (with Sawyer, Miles and Jin) in the seventies - that she would be important and thus had to be kept on the island so she could fulfil her destiny (detonating Jughead). Richard says that Ben will forget everything when he's taken to the source, but do we really believe that he forgot EVERYTHING from the last three years living with Sawyer, Juliet, Jin and Miles? I took it to mean that he would forget the last two days, i.e. Hurley, Jack, Sayid and Kate. Forgetting four people in a village of something like 70-150 people, even if you're a kid, seems a stretch. I'm sure people have been posting this before, but seeing Juliet for the first time could have been a kind of proof to Ben that there was something weird about the big Island Incident that happened when he was a kid, and the appearance of Sawyer, Jin and Miles in 2004 might have sparked the same sensation. We know Ben wasn't special, but there might be more things besides his intelligence that made him aware. Also, did Richard ever tell Ben that he met an adult John Locke in 1954?
Oh Lost, even from beyond the grave you mystify![/spoiler:2qqy8u2d]