Thank you both.
4. I'm a bit confused. Does 知性的女性モテる時代 then actually mean "Era in which intelligent women are popular?" Is the translation that I quoted, "Era of the Intelligent Model", a mistake where someone misread モテる as モデル? (This translation is from a textbook.)
5. That Wikipedia link takes me to the article titled アンパサンド, so I'm thinking something has gone wrong... However, I gather that べらんめえ調 is a kind of Tokyo dialect, right?