In Miss Milly we see only a water trough ― Then in Dead Cold Cash we see a water trough and a well.
In The Princess we see nothing, no water trough, no well ― Then in Two Ounces of Tin we see only a well.
What makes this interesting is how close the first two episodes were filmed and the last two episodes, yet how different the are, even the background. Cowgirl!
We do know they had several different ranch and plenty of props and I'm sure there are more examples and changes in many of the episodes.
Bloopers - The Princess ― Again!