At the beginning of this account the Lord came to Paul and told him to take courage, he would have to testify in Rome. While that takes some of the fear away it makes some of the present inconveniences seem like a charade or mere formalities. Very interesting to think how it might change our lives and our endurance to know specific points in the future with certainty. I'm not sure I would like it.
Paul is given special pretection. I am uncertain whether this was due to his Roman citizenship, the bogus charges against him, or political maneuvering, or all three. Either way the final sentence is significant -- he commanded the Praetorian guard to watch Paul. Caesar's household/palace is not within earshot of the gospel.