Misrepresented abroad? Well. There has been some issues raised by the lasagna sandwich sold in the UK (but it is so easy to find issues with UK food that it's really not even funny anymore) and you could find a picture here:
https://consumermediallc.files.wordpress.com/2012/06/lasagna-sandwich.jpg
I agree that pasta is seen as an Italian specialty. At least, when you go to Italian restaurants, the menu is many times divided between Pizza & Pasta, which is a bit sad because a foodie would love to eat other Italian dishes sometimes! Osso Bucco being an old favorite. And just as true is the fact that, at least where I come from, every family has its own spaghetti sauce recipe and Italy has not much to do with it anymore. Which ain't bad.
I guess what is the most misrepresented abroad would be macaronis. Mac&Cheese and everything, because it contains pasta, do have some Italian tone. However, even if they call it 'macaroni', it really does not make it more Italian. You won't find this kind of pasta on the grocery shelves of the peninsula!