What the previous commenter says about the movie is basically true--this is simply an escapist picture-postcard movie with a bad, clumsy script. The action, what there is of it, makes no particular sense and the romance is dull and pointless. Some lines of dialogue, like the one about "no paragraph about Welshmen" (used twice!) are actually stupid. However, the commenter also went over the top himself when discussing the movie's condescension. Robert Wagner doesn't say "Ah, Madame Butterfly" to a waitress. She's not a waitress, she's a famous Japanese diva that he met on the flight to Japan, and it's explained in the first scene that she's known for playing Butterfly. So there's nothing condescending or inappropriate about it, but this detail is so clumsily placed (like everything else) that I can't blame the viewer for misunderstanding it.
Review of Stopover Tokyo
