Yeah the cashier thing, I don't think I recognise seeing the same person a few times but like the coffee shop down the road I recognise them there.

One funny encounter I had was a few years ago I had just started a new job and on the second day the boss had keys I needed the following day, we both happened to live near each other and he said to met him at a local shop's carpark and exchange the keys, he beat me there so I had to look for him and realised I hadn't memorise any of his features, so I'm there walking around the carpark just looking in cars for a person sitting in a car and saw a guy but he didn't make any movement so thought it wasn't him so kept walking then he gets out and calls out to me. I could tell he thought it was weird I had stared at him for a few seconds and then walked away...