Definitely don't get a lot of what goes on in the US, the number of cars we saw with a sticker "I'm a soccer mom" or "I'm a baseball/ hockey/whatever mom" was utterly baffling to me, just why would you want to drive around with such a declaration I've never worked out what "A Homecoming Queen" is either, but sounds like a load of bollocks a bit daft
Both the US and Australia can refer to quite sizeable outside areas as "the back yard" which kind of conjures up Coronation Street over here.