For those who have never played against North American teams, here are my observations about the differences between US teams and Aussie teams. I am in the US, having just played against Jam, Revolver, Condors and Johnny Bravo. I have also watched 4 Junior teams play.
The Yanks like to throw flat inside forehands more. They don't necessarily try to have a low release like we do. I was impressed seeing a 16 year old girl do it in-game today, effortlessly.
Their backhand hucks are harder to stop - they are thrown from wider. In fact, some teams, like the Condors, almost don't huck flicks (odd to Australians, who almost always have 1 or 2 flick happy throwers, like myself).
They layout cleanly. From a young age, they layout out in a straight line, usually landing on their chest, whether it is an O catch, or a D bid. For years, I have been a mess of elbows and knees, landing on my joints and hips. I have been improving this, but the US sets the standard.
They don't pop. Zone O is a game of patient passing for them, looking for open players as if it was man-on-man D they were facing. The wily popper who "posts up", or the deliberate, planned give-and-go between 2 handlers is far rarer Stateside. So it seems they may have things to learn from Aussies, as well as the many aspects we can take from US ultimate.