Notes to the Apology

18d, a writer of comedies

Aristophanes, who wrote the Clouds, in which Socrates is portrayed as a buffoonish sophist, believing in no gods except the goddess Clouds, while being paid by disciples gathered in his "thinking-shop" that they might learn of the clever use of language, and of things below and above the Earth. Aristophanes is portrayed by Plato in the Symposium as being a good friend of Socrates. 

27e, nor heroes

This addition foreshadows the coming discussion of Achilles—and indicates Socrates' realization that even in the moment of his victory over Meletus, his life is in the hands of the judges—many of whom are dead set on conviction. Socrates has thoroughly defeated Meletus in terms of logic. But he perceives the death sentence is still coming. In the face of that, Socrates will now take the rhetoric of his apologetic finale to the level of menacing anger—and seal his fate with the excess of heroic glory. 

28a, and I perceive it will do so

Socrates acknowledges the likelihood of his defeat in a quiet moment of reflection before he defiantly unleashes on his enemies among the judges. 

30c, Do not make a disturbance

Socrates has so riled up the crowd that even some of the judges are trying to shout him down. 

34a, Adimantus, son of Aristo, whose brother is Plato here

Plato and his brother Adimantus are among Socrates' younger comrades supporting him during the trial.