I think that many, if not most Americans realize that what the British call a biscuit is what we call a cookie and vice versa. A scone (which was the clue) more closely resembles the American version of the biscuit in its appearance but without the sweeteners or fruits that are often added to scones. Either way I don't see that it is a real challenge to get from scone to biscuit especially if you've already made the leap from ocean to sea. Also, roleybob, don't be too quick about not putting gravy on cookies. In the American South, where I'm from, we make chocolate gravy. It was always one of my favorite weekend treats when I was a kid and it's amazing on hot waffles. It'll make your tongue beat your brains out...
Tar is not a synonym for the pitch in Pitch Perfect. Harmonic, modulation, timbre or sound are all examples of synonyms for pitch in it's use a noun meaning tone or sound.
The quiz doesn't concern the actual meanings of the titles, just the words in them. Therefore "tar" is a perfectly acceptable (and quite enjoyable in my opinion) synonym.
There are two Black Knight films. Admittedly not the greatest movies, but they exist. Can this answer be accepted as well? Hilarious quiz in a great series by the way.