Frank Smith brings wine to dinner at Andy's house. Some people think that this is evidence that Mayberry County is no longer a dry county from earlier episodes. However, even in a dry county, alcohol possession would still be legal. A dry county prohibits the manufacturing and selling of alcohol, but it does not prohibit private possession and consumption. Note that Andy only goes after those distilling and selling alcohol, but does not ever go after private citizens. Frank could legally purchase the wine in a wet county, and then bring it to Andy's to drink. This would be perfectly legal.
The name of the wine that Frank Smith brings to dinner is "Pouilly-Fuissé." Pouilly-Fuissé is an appellation for white wine in the Mâconnais subregion of Burgundy in central France, located in the communes of Fuissé, Solutré-Pouilly, Vergisson and Chaintré. Pouilly-Fuissé has Chardonnay as the only grape variety.
We learn in this episode that Andy was Valedictorian of his graduation class.
In this episode, Helen's address on her house is 895.
When Andy and Helen walk up to her front door, the exterior of her house does not match the exterior of the house she is seen living at, two houses down from Andy's house, on the 40 Acres Backlot.