In the restaurant, Peggy orders a cocktail. But this was many years before liquor by the drink was allowed in North Carolina.
In the final scene where Andy and Peggy accidentally meet, he has no idea she's there because she seems to have walked all the way down to the lake, in heels and a dress, without her car.
In the last scene, in addition to Andy not knowing that Peggy is there, she apparently doesn't hear him drive up and park right behind her.
In the restaurant, Andy says that he doesn't know what escargot is, but he would know because that's what Barney unknowingly ordered when they ate at the hotel in Andy and Barney in the Big City (1962).