1. They shouldn't have shown us what the hard drive contains from the first episode. Everything is building towards Juliette finding out, but we as the audience already know and it takes away from the mystery. Even more so they should never have given us any glimpse of how the outside world looks and so early in the show. Whether that's in the books or not, I see it as an important narrative issue personally.
2. The plot twist was entirely obvious from the very beginning. Why do studios keep on (type)casting well-known actors, then having them barely appear on a show/movie until it is revealed they are secretly the villains behind all and expect everyone to be shocked? I hate it when it happens. It takes away from the overall experience.