1. Enthroned kings, like almost everybody else, sometimes complain about their sad fate, and express their "envy" of persons apparently leading a simple life. That is in fact one of the raisons d'être of pastoral poetry - and, surely, of Country music. However, if kings might envy someone, that means they would have reasons to do so, if they knew. In other words, it is a way to say someone is very fortunate.

2. Of course you are right: realism is not the category of the genre. Neither it is of comedy. Still, I feel those authors, definitely including the authors of the Beautiful Girl, did have a sense of the funny side of their work.

Hey, did you happen to see the most beautiful girl in the world?
And if you did, was she crying, crying?
Hey, if you happen to see the most beautiful girl that walked out on me
Tell her, "I'm sorry."

3. The song can be easily googled, e.g. here on YT. It was a world hit, clearly taken seriously in its emotion - and yet the comic aspect would have been very hard to overlook. As I wrote, it is a long tradition, not only in the pastoral genres.

4. So do I, but I think I can safely say myself that the two versions of the chansons are quite similar.

5. That is yours to research. I would be very surprised if the words had been newly written for Tauber.

6. Colony or not, the globalized world is flooded with bits of culture that are not properly understood. Most of it, but not all, is in English language. I am an "intercultural" person too, but even natives can be quite naïve concerning their ancestors' culture.

7. The songs were poorly integrated into the whodunit plot. My point was that present-day TV watchers are no longer riddle-solvers, but expect more athmosphere and personal involvement. The script writers did a reasonably good job there, without severely irritating the Christie fans.

By writing, we educate ourselves and others.