3.) I think the 'Top Topics' are categorizations based upon the words found in the subtitles. Each word in the English language is mapped to a category, and based upon the word content of the show, it is assigned a category. While interesting in theory, it definitely misses the mark on certain shows. I assume The Simpsons is due to their 27 Treehouse of Horror events while the rest of the show does not necessarily have a central focus.