I like Scrum books, usually they provide a new point of view. In this case, do you consider some politics context ?
I mean, the boundary between different actors, such us, project managers, product owner, stakeholders, and the interaction between them, and sometimes consider them although the paradigm does not include them in the iterations.
I've skimmed over the book and while there doesn't appear to be any references to the other roles you mentioned, there are a number of mentions of how project managers fit in Scrum. Perhaps "fit" is not the right word but rather how their role changes in the context of Scrum.
What do you mean? I don't go into topics on how all the other roles work in Scrum, as there are just three roles. I do, however, highlight the importance of teamwork, collective ownership and succeeding or failing as a team.
Like Junilu said, with people come politics. What I find is that with any transition, people get scared. After all, think of the poor project manager. Their job, on paper, is going away. There is no PM job in Scrum or any of the agile practices. This is a scary thing! As long as you go into this with that understanding, you'll find life to be a lot easier. Help guide people, share knowledge and understanding, heck even create a book club! The bonding that happens as people learn together lasts forever.