Pnin Memory and the Past Quotes

How we cite our quotes: (Chapter.Section.Paragraph)

Quote #10

One night, as Dr. Barakan, Pnin, and I were sitting at the Bolotovs, I happened to be talking to the neurologist about a cousin of his, Ludmila, now Lady D—, whom I had known in Yalta, Athens, and London, when suddenly Pnin cried to Dr. Barakan across the table: "Now, don't believe a word he says, Georgiy Aramovich. He makes up everything. He once invented that we were schoolmates in Russia and cribbed at examinations. He is a dreadful inventor (on uzhasniy vidumshchik)." Barakan and I were so astounded by this outburst that we just sat and looked at each other in silence. (7.4.2)

This is a curveball. After all this time listening to the narrator, assuming that he's telling us the truth, we have Pnin basically calling him a liar. If these things are lies, what else is? How does that change Pnin's memories? Are they all made up?