In this episode, Andy says that he and Barney work for the County and are paid by the County. In other episodes it has been established that Andy is the Sheriff of the town of Mayberry and his pay is set by the City Council of Mayberry.
Mr. Frisby was busted for making moonshine, but he wasn't in jail in the last scene.
The fishing line used to make the rooster act drunk is visible (especially looking at the cup to the right of the rooster).
When Barney goes into the barn to get the chickens out and he comes running out as he's being attacked by "flying chickens", you can see the shadows of the crewman (or men) tossing the chickens out.