Ordering a gold forehead star for you, Mark.
In a lot of episodes when there's a scene in town and extras are walking around in the background the same ones will suddenly re-appear walking in another direction.
In "Mountain Wedding" S-3/EP-31 Ernest T Bass "Writes" a note & wraps it around a rock, and heaves it through the "Darling's" Window while trying to court Charlene Darling. However 2 seasons later in S-5/EP-4 "The education of Ernest T Bass" we see that Ernest cannot read or write as he tries to learn so he can get a girl!
Think he had his mother figure come up in the hills helpin' him write the note?
Have you ever noticed that the "Mail Slot" wasn't in the door of the Courthouse in the early episodes.
There was one episode where Barney went to the post office to pick up the mail. There were at least two others that featured a mailman delivering the mail, and in one he he refused to hand the mail to Andy, telling him he wasn't a certified U.S. mail receptacle.
You are SOOOO right Gary W. Burg!
Watching "A Medal for Opie" and noticed that when Barney fires his pistol in the sheriff's office that he completely lowered his right arm all the way to his side. The scene cuts to Andy extending his hand for the pistol and then when they show Barney again his forearm is parallel to the floor not all the way down by his side. Another continuity error.
Same episode - when Andy and Aunt Bee come home from the race, and Opie is moping on the couch, there are a few items on the end table next to the couch including a small chest in the rear. When they switch to the closeups of Opie you should be able to see that small chest but don't. Might not even be the same table based on the color.