Quote: "But why did they just let them run loose? Seems like a plot flaw to let dangerous bears just run around."
I think the point of bringing the polar bears to the island was to experiment with acquainting them to a different environment. When the adjustment was complete, they must have been released to test the results. Remember, the "others" are on a different island, so the bears aren't really very dangerous to the them. This also shows that the bears must have been released and not escaped.
Quote: "Also a friend told me he knows about the numbers and what they mean. I didn't want to know, but he said it is a good explanation. "
All I know is that the numbers add up to 108, which is the amount of time that the button needed pressed. The numbers are used in other various places throughout the show. Overall though, I don't know of anything that they relate to. It seems more that other things relate to them.
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