Can someone help me out with understanding"LOST"?

First question: In the beginning of Season 2, Desmond acted like he didn't know what would happen if the button wasn't pushed. But at the end, it was revealed that he had already experienced that because he was the one who crashed Flight 815. Was it a production error? Or am I missing something?Second question: In the Season 3 premiere, Juliette partially reveals that they are the"remains"of the Dharma Initiative. What are your thoughts? Do you think they're telling the truth? Or is it just another lie? Ben looked pretty suspicious in the last shot.Serious answers only, please.Thanks to all of you who have answered so far. It's gonna be hard to choose a best answer since you've all got the same idea.... Maybe I won't choose one. But anyways, yeah; Season 3 is already shaping up to be full of surprises. Thanks, all my fellow"LOST"fans!

Though you may think that my answer is not serious, it is what I really think. The TV show"Lost"is not about the characters in the show being lost, it's about how to keep the audience watching the show, lost. Since it's about keeping the audience lost, nothing you see in any episode makes sense with any other episode. Just my opinion.

I'm pretty sure he did not know what would happen until the conversation he had with Locke. He put two and two together then realized what would happen if it wasn't pushed. I.E."I crashed your plane"