At 17:27, Samantha hands Louise flowers. Louise puts them on the coffee table. At 17:34 the flowers are still on the table. At 18:01 when they cut back to Louise, the flowers have disappeared from the coffee table. When they cut back to Louise again at 18:08, the flowers have reappeared.
While in her front yard, Gladys sees Samantha diving into a pool in her backyard across the road. Problem is that the backyard can't be seen from the street as it is behind the house.