Roberta turning into her mother, & Federline bailing, was absolutely the best part. And nicely wrapped up at the end with Junior transferring his crush over to her. "Oh, no! I'm not comin' within a country mile of anything that might give me one of those."
I didn't really get the Svetlana thread. Is that a movie reference that I don't know?
I don't know. The limitations of Amazo were pretty clear from watching it fight. It could only access one power at a time. The obvious answer was to bombard it from multiple directions until it couldn't keep up with power-switching.