With respect to its colonies, British mercantilism meant that the government and the merchants became partners with the goal of increasing political power and private wealth, to the exclusion of other empires.
Japan has many mountains, thus, the outsiders could not easily enter Japan and Japanese could not leave the country. And, thus the self-isolation was helped by the presence of a mountain terrain. This policy was implemented by Togukawa, who insisted on preventing Japan from foreigners.
Don Shirley is a snobbish, polite, and mild-mannered concert pianist. While he does not appreciate Vallelonga's more exuberant and loud-mouthed affects at first, he comes to appreciate them in time as the two become closer. Indeed, Don is often put off by Vallelonga's attitude and finds him coarse and impolite
There will probably be many new kinds of technology by 2028. One way people could be viewing digital videos is virtual reality. That technology already exists today, and could be improved a lot by then.