The Andy Griffith ShowGoofs

In episodes such as Barney and the Choir (1962) and Rafe Hollister Sings (1963), it is firmly established that Barney cannot sing very well and is often "off key". However, in other episodes where Andy and Barney are singing while working or sitting on Andy's front porch, Barney sings "on key".

In the first half of the first season there is a sign in the drug store above a shelf which said "Enlargments" a misspelling of "Enlargements" which was seen corrected later.

There are discrepancies as to the marital/family status of Floyd the Barber. In The Jinx (1962), Floyd mentions having a son named "Norman". In "Those Gossipin' Men", his son appears playing saxophone. And in other episodes, Floyd mentions being married. However, in Floyd, the Gay Deceiver (1962), the premise of the episode is that Floyd is single and finds a companion through a "lonely hearts"/"pen pal" service. But in that episode, there is no mention of his son or that he is either divorced or widowed.

In the first couple of seasons there is window to the left of the entrance (as seen from the street outside) but inside the Sheriff's office there is no window. In later seasons this error was corrected.

In Andy's house there is a short window to the left of the fireplace and in some episodes there is either a long window or a glass door.

Over the years, the Taylor home back porch changed from a simple set of steps in Mr. McBeevee (1962) to a large porch with room for a freezer, sink, and wringer washer in Bargain Day (1964) then back to a very small porch in Opie Finds a Baby (1966) and Only a Rose (1966).

It's been established that the Mayor's Office is above the courthouse and jail. However there is no indication either inside or outside the courthouse that there is any access to the Mayor's office from the street level or inside the jail. At one point early in the series there was a door to the left of the jail cells which was later removed that could have been an access to the upstairs offices but since no one was ever seen using it and it was later removed from the set, there's no way of knowing. In The Beauty Contest (1961), Ellie and Andy depart from a meeting in Mayor Pike's office through the side door of the courthouse. From this episode we can infer that there are steps inside this door that lead upstairs to government offices on an upper floor. However, in most other episodes this door just enters into the back room of the jail.

In North Carolina, sheriffs are independently-elected county officials. Their duties include providing law enforcement to unincorporated areas. A town, such as Mayberry, with a mayor and council would have its own police force. A sheriff is not responsible to county officials, let alone to a city official such as a mayor.

The badges that Andy and Barney wear are the 6 pointed star, yet the shoulder patch on their uniform shows a 5 pointed star. It would be assumed that the badge indicating they are a sheriff or deputy would be the same as the shoulder patch indicating they are with the sheriff's office.