As for the Japense, you will have to look up the specifics but there was an incident in Hawaii after pearl harbor where a Japanese plane crashed on one of the remote islands that was populated by some Japanese Americans. Some of whom did show support to Japan and took him in and protected him. Some though of lesser Japanese sympathy snuck off the island to tell authorities who then arrested the pilot.
This was part of the reason people were scared of which way Japanese Americans would turn in the event of saboteurs or an invasion.
It was Nihau (?) I believe. A privately owned island off Kauai whose farm labor inhabitants (primarily native Hawaiian and some Japanese American) were kept isolated from of the outside world by the owner for religious reasons. I was in Kauai last year and that is apparently still the case to a large extent. While there, I picked up and read a semi-fictionalized account of this event that suggested that the Japanese pilot was able to convince some of the Japanese-Americans (who did not know the Pearl Harbor raid had even occurred) that Japan had successfully invaded the Hawaiian Islands and that people who sheltered him would be well-treated when the occupying army arrived. If this is even remotely true, this account puts a different light on the actions of those who sheltered the pilot and (according to the fictionalized account) sought to help him destroy is papers and aircraft.