As a dude with a Canadian accent, living in England, I get the following question on a regular basis. Doesn't matter if I'm draped in the Canadian flag, wear a Vancouver 'Canucks' baseball cap, or ride around on a polar bear. Yes, I often get asked this, 'what part of America are you from?' Now this makes for a fun conversation and invariably I will ask the person with the English accent, 'what part of Scotland are you from?' One day, knowing my luck, someone will reply 'Glasgow'.
So with that, I try to explain the differences. I keep it nice and simple. 'In Canada, we say 'eh' a lot eh. I think we have a mellower accent than the Americans. Let me give you an example of a Canadian speaking. 'How's it goin' eh!?' Whilst an American, in a New York accent, might say, 'eh how ya doin'!?' 'Okay, I get it. Let me try doing your Canadian accent', says the English chap, 'hey, how y'all doin' good buddy!?' Thus, much to my bewilderment, the English chap does my accent, sounding like some dude from a trailer park in Alabama.