In Strange Tales from a Lonely Studio, it is said that a camera can shoot a "ghost". Why?

According to the scientific method, it is precisely because of the exposure principle of the camera, some reflections and the Dindar phenomenon in nature that the so-called "yin-body", that is, "ghost", is produced under special coincidence. But that's not real ghosts, just some ghosts or light and shadow. It is said that film cameras are more prone to afterimages.