I have people pick out vegetables or fruits that I have either never seen or maybe seen once in my life. I say to them "sorry - I'm not familiar with this - what is it".
Islandpacific if I pick up an unfamiliar item, I am careful to notice the name, or at least the price, I want to make sure the checker doesn’t overcharge me. But above all I remember the code. Very likely I would be doing the self check out and I need to know the code, rather than ask the person in charge of the check out to find it for me (she would do it, but that takes time).
Indeed, when I go to a cashier, I watch her like a hawk; make sure she is punching the right item. It has happened quite a few times, that she punched the wrong item, to my disadvantage (if she rings a wrong item to my advantage, of course I keep quiet). I think most shoppers just don’t notice it, they assume that the checker knows what she is doing. Sometimes the code on the item happens to be wrong, you may have bought a basket of peaches, but when she punches in the code, it comes out grapes, and neither of you may notice.
But many times she would punch in wrong potatoes, wrong plums etc. It especially happens with obscure items. I remember last year they had two kinds of persimmons in the store. Hachiya persimmon was $1.79 each, while the fuyu persimmon (Sharon fruit) was 50 cents each. As it happened, I went to the cashier several times in a row. Almost every time she rang up the wrong persimmon, and I had t correct her.
They also routinely confuse between cooking onion and Spanish onion (they look somewhat similar, but one is much cheaper than the other).
When I am checking out with a cashier, I keep my eyes peeled to spot any mistake she makes. It certainly is worth the effort. As I said before, most people probably assume that the cashier knows what she is doing and don’t pay any attention to what she is ringing.