Andy hardly ever wore a gun. In this episode he takes the gun of his deputy and shoots at escaping suspects. This is extremely rare for this show.
The "printers" are concerned someone will hear the printing press actuating. Without this sound, it would seem more suspicious.
In this episode, Aunt Bee reveals that her birthday is March 17th (Saint Patrick's Day) and Clara Cartwright's birthday in August 21st.
The platinum blue station wagon that belongs to the counterfeiters will officially become Howard Sprague's car when he joins the cast later that season.
Actress Maggie Magennis is listed in the credits as Violet Rose yet during the episode she is consistently referred to as Violet Rose Schumacher. They are the same name and person, as such, this doesn't seem to be worth mentioning.