I always thought that the "road" where James pulls up to meet Donna in episode 23 would be on top of a large hill or mountain –the angle of the shot makes it looks so high up. However, the actual area where the scene was filmed is generally pretty flat, as it's located in a valley. It's actually just up a minimal bump along a dirt path in the same park where they shot Earle's Cabin, Glastonberry Grove, etc. They simply placed the camera down in what's essentially a ditch in order to give the illusion of height. It worked.