A subject-verb disagreement is when we use the plural-form verb for a single-form noun or a single-form verb is used for a plural noun, for example "she read" or "they reads". In the text the three subject-verb disagreements are: 1. "app that ask people" it should be: "app that asks people" because app is a singular noun. 2. "There are a difference", the correct form would be: "There is a difference" because difference is a singular noun. 3. "What the public actually desire" it should be: What the public actually desires" because public is a singular noun.
"During the shop’s peak hours – from eight in the evening till around midnight – one could hardly hear oneself talk because of the boisterous chatters that went on."
