| Quote #4
Shylock's offer seems too generous not to come with a catch. Still, perhaps he's trying to be the bigger man of the two. He might be offering up his friendship, and seeking Antonio's, because he sees these unusual circumstances as a chance for the two to break their cultural isolation from each other.
| Quote #5
Jessica is isolated. She neither fits in with her father (and implicitly her Jewish background) nor is she a Christian. This tension causes her distress. She's willing to abandon her father and her religion to resolve it and join a community she can relate with more.
| Quote #6
Rather than look on Shylock with pity, the boys of the town make a mockery of him. This will likely make him even more enraged. Shylock was isolated before, but now that he's lost Jessica, he needs mercy more than ever. Not getting it, he'll turn his wrath against the people who have mocked him and his religion.