I can't figure out if the Senkan Yamato episode is meant to be a homage or just something the creators wanted to throw in. The feel I get from the commentaries is that it's the latter. I like it when the creators do what they want to do, instead of doing something for popularity, fame, or money.
Episode 10 is mostly Matsuri-chan's episode, possibly not intentionally. She's the one making everything happen, even if she is not in the middle of any of it. It's one of my favorite episodes.
Tama (Binbougami)'s behavior is just so cute because I can never get used to it.
They know it can't float in that shallow water, but it's okay because it's just the soul of the ship.