The camera was not moving from one sample to another when in play mode and in the game view. This was fixed by properly assigning the camera to the script that controls the camera. Now it moves correctly.
The information signs in the scenes are facing away from the main light source, so the text on the signs is in shadow. I improved the readability of the text by increasing the brightness of shadow areas using the post-process settings. The light direction in the scene is currently set to get maximum visual quality on the terrain, so it's not possible for the light to face the opposite direction.