They deliberately put the flute riff in to assert their Australianess.
Just listend to the song on Youtube and it is definately full of flute
Of course they did.
It's a shame that this didn't happen before Marion Sinclair passed away. I wonder if she ever commented on it. It's also a shame that this judgment is just going to the publishing house and not the Girl Guides...but I suppose that for the Girl Guides to get it, the judge would have to side with Men at Work and there'd be no judgment at all.