Here’s my bit, but I’ll skip 2 & 4 since @FreedomFlower’s responses seemed to answer it (and their 3 makes sense too, but I have a different angle), and skip 1 since I’ve never listened to the album in that way, yet.
- I thought they intentionally used the wrong plural of mice (three blind mice) because it sounds good/rhymes (although @FreedomFlower’s cartoon reference makes sense). And I would guess that Sir Nose hates the mice because they are “such a sight”, I assume looking so uncool chasing “after the farmer’s wife”. In numerous interviews George has mentioned that Sir Nose wants to look cool above all else, and that he thinks he’s too cool even for sex.
In George’s memoir/autobiography he says it’s a “layered pun”: both “motor boat” and “Motor City” (and people say You Shouldn’t-Nuf Bit Fish is bad, at least you notice something is going on). Also there are a number of tracks that I believe could be outtakes like “Funky Parts”, “Insurance Man For The Funk”, “I’ll Be With You”, “Chug-A-Lug (The Bun Patrol)” and “Body Shop” which have a heavier (Auto) Motor-Booty Affair slant in lyrics and sounds. I think that there could have been an earlier vision for the album themed more around Detroit and the automotive industry. (I also think the same thing could have happened with the baby/toddler theming of Electric Spanking, with lots of baby themed tracks popping up later, but the album landing on the politics/war theme.)