I think there was a door behind the heater, to the left of cell number 2. Maybe that was a bathroom, but then later it disappeared.
The only mention of a bathroom that I remember was "Goober and the art of love" where Helen and Thelma Lou go to the ladies room to fix their hair. And that was in the courthouse.
Sorry about that. No bathroom, just a mirror. Just watched this again.
I've always wondered how Malcom Merrywether can travel the broad expanse of the USA on only a bicycle. Also, in the episode when Andy first meets Malcom in front of his house there is what looks like Barney's first car parked right smack dab in Andy's driveway.
Hope this hasn't been mentioned, but I noticed the other day:
When Andy and Barney cross the "Robert E. Lee Natural Bridge" to rid the Darling's of Ernest T. Bass, at one point they are in the cabin and there is a window on either side of the front door. Through the left window, trees are clearly visible. When they walk out on the front porch to confront Ernest T., there is a room addition that would completely obscure any view that window could have of the outdoors.