Only that it's a few decades old now, so you may want to check it against more recent findings. My impression is that it's held up pretty well.

Oh, you'll get angry when you see the word 'meme' used to refer to the narrow concept of momentarily-popular-Internet-things, but that will pass eventually.

None come to mind. However, I read it over a fairly long period (I was reading other things at the same time) so I may have just forgotten them.