Scott McNeil is a Canadian. Yes, he was born in Australia, but he moved to Canada when was still an infant and grew up there his whole life. He's really Canadian, and I suspect that he carries a Canadian passport, and AFAIK he identifies himself as being Canadian. There are plenty of Australians who were born overseas but identify themselves as being Australian (as does the public), but just sticking with those who worked on Transformers, Hugo Weaving is identified as an Australian but he was born in Nigeria.