I've just been listening to CI talking on the BBC about how his memory would make things up. He'd argue with Auden over quotes - asserting that certain quotes existed - but then never could find them in any reference books. It drove poor Wystan quite mad. Apparently.
My dad used to accuse my mum of having a creative memory. It drove her quite mad. I think that was just horrid old-fashioned sexism. Poor mum.