The table lamp in Barney's boarding house room is the same prop used in season 4, episode 2 "The Haunted House."
Andy asks Barney if he would ever be interested in coming back to Mayberry, mentioning that the deputy position was still open. That would mean there is no deputy and no mention of what happened to Warren Ferguson.
Richard X. Slattery played a role in Mayberry R.F.D., as well as a part in The Apple Dumpling Gang Rides Again, which starred Don Knotts.
In Barney's room on the wall between the bed and sink hangs the newspaper that has Barney's cave rescue from season 4's Barney and the Cave Rescue.
Luana Anders plays Miss Clark in the two Raleigh episodes. Like Jack Nicholson she would take on roles about as far away from Mayberry as you can imagine: appearing as the star of Francis Ford Coppola's cult classic "Dementia 13," as well as other avant-garde films like "Easy Rider," "The Trip," "The Last Detail," and "Goin' South"; all of them with Nicholson.