During the Sunday, March 9th episode of "Dexter" on CBS television, his father is taking a family picture on the beach. He sets the camera on the top of a Coleman "Extreme" brand of cooler. This brand is readily recognizable by its unique top and color. The cooler is shown two or three times. This model of cooler has only been around for ten years or so. Given Dexter's age in the series and his age when the photo was taken, there's no way that cooler was around at that time.