I was around at the time Bob was filmed. There was a lot of anticipation ahead of it's premier. Franco was still Da Man in Spain and the Spanish airforce was made up almost exclusively of vintage WWII era German aircraft, some of Spanish manufacture made under license. The film makers basically rented the entire Spanish airforce for the making of the movie. Periodicals of the time like Life Magazine and the Sat. Evening Post carried pictorials of the movie making in progress.
As far as the "absolute trash 80's music", I kinda liked it. I might be considered an old dude by some but I appreciate music that gets my adrenaline flowing and better puts me and my imagination into the action. I don't relate as well to music from 60 or more years ago. That's me. I've often thought that the musical score of today's historically themed films could much better entice and hold the interest of younger people if it was something they could relate to. To each their own.