It seems to me that there are some similarities between perfect pitch and a photographic memory. Does anyone here have both (I have neither, but good relative pitch and chord awareness)?

I don't either but, if I write down the words of a song on paper with a pen, I can more or less visualise the handwriting on the sheet if I close my eyes - which is a great help in learning a song. I wouldn't call it a photographic memory, but a reasonably good general visual one.