A major improvement over the first game is that subjects disappear from the list as you exhaust that topic. I miss the verbal sparring between Gabriel and Grace from the first game. They don't even directly interact until the final chapter. The game loses a lot of character this way. The worst feature of this game is the way it handles the end of one chapter and the start of the next.
Every chapter starts and ends with a movie.
Chapter 4 is not fun. You must be systematic and patient to succeed. It is very easy to miss something, and until you finish, your path may be blocked. You'll just keep going around and around hoping that sometime you'll notice that one extra item. Actually, there may be a small bug here.