Japan puts
immense significance to their Mon -which is the equivalent of a coat of arms or heraldry in western society- and the families that they represent. In the preview image and at 15 minutes into the video, George Washington is shown to have the
Tokugawa Mon on his person.
(the Mon of the Tokugawa clan, for reference)
This, in the context of Japanese culture,
has immense significance. If someone
not of the clan gets the mon, either they are adopted into the clan (oddly enough, Japanese adoption practices is quite similar to
Roman adoption practices at times)
or (from what I've read more commonly) they are considered
a friend of the clan and thus are given a great honor. The Tokugawa -and Japan in general- were so impressed by George Washington that they gave him the honor as a friend of the Tokugawa.