How we cite our quotes: (section: I, II, etc.)
Quote #1
The only moving thing
Was the eye of the blackbird. (Section I)
At several places in the poem, the speaker juxtaposes (places side by side) images of vast landscapes and the blackbird. He makes the blackbird seem totally powerful and mysterious by making its eyeball the focal point of the whole scene. To the imagination, that eye seems as big as the giant eye of the T-Rex in that famous scene from Jurassic Park.
Quote #2
I do not know which to prefer,
The beauty of inflections
Or the beauty of innuendoes,
The blackbird whistling
Or just after. (Section V)
The use of complex vocab-words like "inflections" and "innuendos" actually makes the speaker sound less amazed. He puts his intense feelings into intellectual terms.
Quote #3
The mood
Traced in the shadow
An indecipherable cause. (Section VI)
One of the reasons the blackbird is so amazing is that it inspires the speaker's imagination. The sensations caused by the sight of the blackbird are indescribable, so he's left with vague, hard-to-follow expressions like "mood traced in the shadow" and "indecipherable cause."