Hmmm. Ellison disputes some of their recollections about City, especially about him being drunk, since he doesn't drink. There are some other inaccuracies I spotted, but I can't think of any offhand. I'd have to go through the book again.
We should also be aware this is a memoir, so virtually every dialog in it is a best a paraphrase, because who can really remember exactly what was said in a conversation 30 years hence.