@OneThreadOnly This is absolutely me: I can't recognise faces very well. I remember people's shoes instead, and I often notice those first. Similarly, the hat thing. If someone wears a swimming hat which hides their hair, I often can't recognise them at all.
As for pointing things out, as a child I always pointed out if someone wore shoes without socks, because I wasn't allowed to do this. Even now, I still notice it. (And nobody will stop me doing the same now!)
I used to comment on lots of things on the road, especially if they were rarely seen: reversing lights lit. Level crossings closing: bonus points if you see the amber light come on, very rare. I loved road signs, I learned them at a young age. My favourites were (and still are) "Risk of falling rocks", and "Quayside or river bank", with the car falling into water.
Somebody I know who is a tube driver says there is a bridge leading into a north London park, where there are often families waving to the trains. The drivers often wave back, and sound the whistle.