Mr. Underwood's editorial defending Tom Robinson was surprising because he is known for not liking African-American people. In Chapter 16, Atticus says, "'You know, it’s a funny thing about Braxton,' said Atticus. 'He despises Negroes, won’t have one near him.'" Although supposedly Mr. Underwood had these beliefs, it appears that he changed in the story, since he wrote an editorial about injustice.
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Antony keeps referring to Brutus as an "honest" man because he's being sarcastic. What he says and what he means are two completely different things. He's prodding at Brutus' guilt..... trying to get under his skin. The fact that Brutus really is honorable makes the sarcasm even more potent. None-the-less, the first time he attributes honor to Brutus, the audience is with him..... but by the time Antony's done, the audience is questioning that honor.. not applauding it.