A) Signalling the beginning of "paces" in the feud,
2) Finding out that Barney's gun really was loaded after Gentleman Dan handed it to Andy and
C) Shooting the tire in the counterfeiters' station wagon. We're sure Miss Crump will be hearing about it if we've forgotten another occasion where Andy fires a revolver.
There are a few more hints here and there, but they're all in scenes that are always cut out. In "Class Reunion" Andy says he used to strike matches on the soles of his daddy's boots, and in "Keeper of the Flame," Andy tells his son that he too used to be keeper of the flame for a secret club, until his (Andy's) daddy indicated that he ought to give up the job. Andy adds, "...and he indicated it REAL good, right back there" (he pats his rear end.)
There's also a scene in "A Plaque for Mayberry," that sort of fits this category. Opie asks if it's barely possible that Nathan Tibbs could have been his grandpa. Andy says it's not even remotely possible, because that would have made Nathan Tibbs his Paw, and that would make him out to be at least 170 years old.
BTW, Aunt Bee must be the sister of Andy's father. If she were the sister of Andy's mother, her last name would not be Taylor (unless Andy's mother's maiden name also happened to be Taylor.) --Paul Mulik
Wedding Bells for Aunt Bee
Three's a Crowd
The Bookie Barber
High Noon in Mayberry
The Great Filling Station Robbery
Prisoner of Love
Cousin Virgil - (backroom of the jail smoking, patiently waiting for Virgil to get Otis out of the cell!)added by Jason Brown
The Clubmen - (At the very beginning, Andy is seen with a cigarette as he and Roger Courtney pull up to the courthouse after fishing.)added by Jason Brown
Gomer the House Guest - (in this one he smokes IN BED -- shocking!)
That makes 13, unless we've missed one.
BTW, I think it's worth mentioning that this was before the dangers of cigarette smoking were widely known. In those days Andy Griffith smoked in real life, but when the surgeon general came out with the cancer warnings in the mid 1960s, he quit smoking (good for him!) -Paul Mulik
Many, many familiar faces from Mayberry were seen in episodes of Gomer Pyle - USMC (too many to list here; there must be at least 100 of them), but the only actors to play the same characters on both shows were Gomer, Goober, Andy, Aunt Bee, Opie, and Sgt. Carter. --Paul Mulik
She's a choir member named Sharon in "The Song Festers." That's the episode where John asks Gomer to sing "Santa Lucia." She speaks one line: "I'm sorry, Mr. Masters."
In "Opie Loves Helen," Andy Taylor mentions that as a schoolboy, he once had a crush on a girl named Barbara Edwards -- that was Mrs. Griffith's maiden name. --Paul Muilk