Gomer and Thelma Lou's trip scene starts showing the truck going down the road. It has a small rear window and nothing in the back. The shot of them talking shows the truck having a full size rear window, covered by what looks like a tarp.
When Gomer tells Barney he'll drive Thelma Lou to her dental appointment, the window blinds are open behind Andy's desk. Backdrop scenery was missing, and the elaborate Spanish-style homes stacked on the Hollywood Hills are visible in the "Mayberry" background.