Nobody in Australia calls the season "Fall". It is universally "Autumn" here.
Regarding Americans not being able to pronounce America, they don't pronounce Australia the way we would, either. Americans tend to say "OSS-trayl-ya" or "ORS-trayl-ya", and refer to the people as "OSS-tray-lee-ans" or (colloquially) "OSS-eez". Australians place very little emphasis on the initial syllable of "Australia", so it sounds more like "Oz-TRAY-ya" or (for those who are lazier) simply"'-STRAY-a". The people are "'-STRAY-yans" or "OZZ-ies" or even "'-STRINE-s", that latter word strine also being a tongue-in-cheek word used to describe our national dialect and its unique words and turns of phrase.