It's no secret that an injury while running errands is a sure way to ruin your day, especially if the retail establishment was at fault. In this case, it makes sense that you would expect them to cover the expenses incurred by their negligence. When filing a personal injury claim against a retail establishment, make sure to avoid making the following mistakes. #1: Failing to collect immediate evidence Most injuries to customers at retail establishments are the result of temporary negligence – a water spill that wasn't cleaned in a timely manner or a loose hand rail, for example.