Sure! From what I remember... So the novel is actually a 999-line poem, and then contains another document with 'notes' from the poet as to how it should be read (which is another novel, alongside the first 'poem'). You can see the entire original set here: https://www.amazon.ca/Pale-Fire-Poem-Cantos-Shade/dp/1584234318
Nabokov intended it to be physically read like this, so you have the cards next to the lines of the poem to compare. It makes much more sense if you do.
The poem has four cantos, of which each of them contains a big theme that Nabokov sets out to explore and finds an answer to within the poem. You can shuffle them and read them arbitrarily, but they kind of change the overall meaning of the book depending on the order you read them.
Now, I only remember one of them, which deals with kind of the randomness of life, and how searching for deeper meaning only brings you towards something random, which has some kind of deeper, mysterious beauty that should be appreciated.
These were the lines my professor pointed in that canto and which have stuck with me over the years:
Life Everlasting — based on a misprint!
I mused as I drove homeward: take the hint.
And stop investigating my abyss?
But all at once it dawned on me that this
Was the real point, the contrapuntal theme;
Just this: not text, but texture; not the dream
But topsy-turvical coincidence,
Not flimsy nonsense, but a web of sense.
Yes! It sufficed that I in life could find
Some kind of link-and-bobolink, some kind
Of correlated pattern m the game,
Plexed artistry, and something of the some
Pleasure in it as they who played it found.