I routinely forget to scan whatever is on the bottom of the cart. Usually cases of water but a few times it was the box of 32 hamburgers. I never had a cashier catch it - and they're invariably surprised when I come back into pay.
Another store (I forget which) had a full cart camera and prompted me to check my cart for remaining items because I had unused reusable bags in it.
I've seen that, now that you mention it. It must have been on a trip. None nearby have it.
> Another store (I forget which) had a full cart camera and prompted me to check my cart for remaining items because I had unused reusable bags in it.
That's a new one. I'm not sure if getting flagged would be more annoying than having to go back.