Who is the narrator, can she or he read minds, and, more importantly, can we trust her or him?
N/A—It's a Drama
Even though The Clouds is a drama—and therefore doesn't have a typical narrator—it does give us a little more to work with in terms of POV because we get the Chorus speaking for the author via the parabasis (an interlude in which the Chorus addresses the audience directly with what's on the author's mind).
For example, in one parabasis from The Clouds, the Chorus acknowledges that the play is up for a prize (and advocates that the audience vote for it).
The parabasis was also an opportunity for political commentary. The Chorus gets on the Athenian audience's case for electing a man named Cleon (who had been portrayed in Aristophanes's Knights via the character Paphlagon):
"Spectators and critics, give an ear to what I say. / We've a gripe against you, and we'll lodge it openly. / Of all the gods we do the most good for this city, / but we're the only gods that get no sacrifices, / no libations, though we look out for you. Whenever / you marshal a stupid expedition, we rain and thunder. / When you went to vote for the god-hated tanner Paphlagon, / in the election for generals, we knitted our brows together / and made a lot of noise with lightning and thunderbolts, / and the moon eclipsed herself from orbit, and the Sun / pulled his blazing wick right back into his lamp and refused to shine on you if you elected Cleon." (575-586)
Sure, it doesn't have a ton to do with the actual nitty gritty of the plot regarding Strepsiades, but these little asides are definitely examples of authorial POV and reflect the play's overarching interest in taking down flawed ideas and public figures who don't deserve widespread praise… you know, like Socrates.