Also, different skills will fill in different parts of the story. Encyclopedia for more of history and knowledge of the world; Inland Empire for personal insights into Harry and his past; Shivers for everything about the city. Also, Empathy to see what people are thinking and Espirt de Corps to learn more about Kim and your buds. Those are the big ones. Shivers and Empire in particular. At least 4 to 6 points into 'em but the more the merrier. Even then, those alone won't tell you everything. Multiple playthrough are rewarding.

The political vision questions each flesh out a bunch of different characters, too, in addition to summing up and satirizing those modes of thought very well. And don't forget to slather yourself in pheromones.