A pencil sketch illustrating the line "three Puddle-ducks stopped and stood in a row, staring up at the kittens" depicted the duck on the right facing the other two ducks, apparently in conversation. However when Potter copied her sketch for the book picture she inadvertently turned the duck's head to the right (like the other two ducks) with all three now facing the same direction. Although the kittens are not shown in the picture, the ducks now have their backs to the kittens sitting on the wall and cannot be staring up at them as the line indicates – but only those who are familiar with Sawrey would realize this.