When part one was mostly about introducing Jack and all the characters revolving around him, part two focused more on Kate and Charlie. Secrets were revealed in the past episode and some of them are partially solved. Indeed a puzzle is not only made up by one piece. Moreover it seems other characters also have secrets. So when part one was scary at times the second uses more mystery elements. But fantasy ones are also covered and a scene in the jungle should really surprise you. In fact it's probably in most fans top 5 list. Let's also not forget the cult and ambivalent scene with John Locke and Walt. About Charlie his story is interesting and some people should be able to relate to him but I think the actor did a poor job. Kate has a complete different story even if they obviously have things in common. We learn more about her crash experience and her relationship with an other character. I specially enjoyed that she wasn't just all black or white. Moreover when the beach scene could have been cheesy the writers had the great idea of using Sun. Her tense and complex relationship with her husband Jin brings so much to the show. Sawyer and Sayid also have a few scenes. We soon understand that they're all connected. For example when two of them decide to go on a little adventure others soon follow. It was specially interesting to see Shannon reacting to Boon's comment, her brother. Last but not least the episode was also surprisingly funny and some scenes should make you laugh out loud.