Nighttime scenes are filmed using a filter to make the scene appear to be night. But night skies often alternate between being light and dark, while distant objects are often obvious or are obscured by the darkness. But the night sky is always black and distant objects fade to nothing in the dark.
When Mark and Paula are sitting on the park bench and Kerric is watching them from behind a tree, there is a bunch of kids playing cowboys and Indians. Mark gives the kids a "buck" and tells them Kerric is an Indian. The kids take off after Kerric, and Mark writes in his notebook "Indians---one dollar." However, he designated Kerric as a singular Indian; he paid a dollar to the multiple "cowboys."