During the opening scene, there is a girl sliding down in the playground. Once she walks away, her hair is still floating up in air and keeps floating until the scene is over.
During the opening scene, Dr. Quilty is shown watching the playground by staying close to the left side of the window. Once perspective changes while she is talking, she is much farther and by the right side of the window.
While Dr. Quilty is crying beside the camera and its tripod stand, it is visible that the stand lies between her and the tree. Once perspective changes to show her talking, the stand is missing. The stand reappears in the following scenes.