When Barney meets Warren in the courthouse, the window behind Andy's desk shows a wooded forest when it should show buildings on the other side of the street.
Barney's uniform shirt and pants are different colors.
Outdoor scenes around town would all have to be accompanied by a small army of equipment trucks and utility vehicles. Close-ups of Barney sitting in his convertible trying to leave the Taylor home for fear of Avery Noonan show the shadow of one of these vehicles, or some other square shaped piece of equipment, in the background.
Andy and Aunt Bee tell Barney what a fine deputy Warren has been so far, when in fact he's: given out petty tickets for matching pennies, arrested 30 women for playing bingo, caused Andy to stub his toe, injure his wrist, and fall into the lake with Helen, given the keys to the Mobile Museum to a thief, accidentally fired the city cannon causing a car wreck, not spotting counterfeiters who have stacks of money right in front of him, and making two passes at Helen.
Barney doesn't seem to know about his own idol, Skeets Gallagher. He claims Skeets was Tailspin Tommy's sidekick, but in fact Skeeter Milligan was Tommy's sidekick. Skeets Gallagher was the name of an actor in the 30s and 40s.