Credit card signatures: It depends on the store. If the store is in a high-crime area, they’ll ask for your driver’s license and actually match you to the card. For a $5 purchase.
Also, if you’re selling very high-end merch, you get the special VIP treatment. We take you into the hidden ‘VIP’ room where you can sit at a table, a salesman pours you a beer, we all stand around and chat with you - while another salesman runs into the back room and runs a quickie credit check on you.