Satire of American Cinema?
The musical scenes seem to borrow or poke fun at american movies.
Grease seems to be the inspiration for the Richard "I love you" song, even down to flying and singing in english.
Thriller (albeit not a movie in its own right) seemed to inspire the zombies musical number.
Also random scenes of running in the fields (featured on the cover) are right out of "The Sound of Music".
Also still are little things like naming the dog "Pochie" (Poochie?).
Any thoughts?