Since 1941, Arizona has been leaking oil into the harbor. Old sailor's lore is she will continue to weep until the last Pearl Harbor survivor shifts colors.
A few of those answers are all but unknown to most outside of North America. Who the heck is Gordon Lightfoot? The rest of the world tends not to study the Spanish-American war in great detail and a question on a US sitcom that stopped recording over 50 years ago? It may have been popular in the States but surprisingly the rest of the world don't show repeats of it any more. Indeed, I don't think it's been shown over here for 30/40 years.
Great idea for a quiz, I don't mean to be totally negative. I just think some more famous potential answers were missed in favour of some obscure answers that those of us not from North America have virtually no chance of knowing.