Can you spot the mistake: A day at the Soyapango Mercado

It wasn’t until after I watched the video a couple of times that I saw the mistake. How fast are you to spot it? I was out in Soyapango today discussing some custom furniture with a carpenter there and he was right in the market area. So once we left his shop we did some grocery shopping. I am with Stan and his friend, she is translating for me when needed. Stan is our friend and driver from our trip here last summer.