Tempest's Downpour -- Anime In-Jokes 5: Japanese Home Life Edition

I'm back to teaching all you newbs the basics of Japanese Cultural Relevance 101. This time, we're chilling in a Japanese household (not so chilly if you're under the kotatsu), eating all their food and stealing all the hot water in their baths. Click here for your cultural enlightenment and don't forget to tell me what I forgot to mention.