Don't forget that this song was written by Rolf Harris, so it - in all probability - was never intended to be taken seriously, and certainly not intended to be analysed logically. It's really more of a vehicle for playing on words and for using a string of Oz images.

As a young child, when I was first visiting the library in the early 60's there was only one picture book in the kids section which had *anything* to do with Australia. It was called Ambrose Kangaroo and it was one of the silliest, most useless books I've ever read in my life (& being an ex-librarian and perpetual student the total amounts to a mountain of books) but my sister & I kept on borrowing it just because it had some reference to an Oz image. Ambrose was nothing like a kangaroo at all, and there was no real Oz reference in it.

Maybe that will help you to think about why Rolf Harris was so popular in Oz then. He was one of a very few people who were using Oz-related images in the performing arts or other cultural formats.

Helen