Such an interesting topic. I can usually pick NZ accents, even from people who have been in Aussie since childhood which really pisses (one meaning:)) them off. But I totally agree with the flattening of the Yank accent. We do get inundated with American TV (and I don’t watch it) much but we are breeding a whole tribe of Aussies actors who can take it off to the satisfaction of the American public.
I’m also pretty good on S Africans, in part due to my husband working with them for some years.
“Fanny” - wow, such a divide. In America an innocent reference to the bum/bottom/gluteous maximus- in Aussie a reference to something much more intimate and unmentionable.