This is the only episode to have just three characters appear (Andy, Barney and Otis), the fewest of the series. "Man In The Middle" (Season 5, Episode 7) is next, with four.
Otis' car is a 1933 Ford Model 40 Cabriolet.
This is another time when Barney, the notoriously bad singer, does a good job of singing.
Otis is driving again in Season 5, Episode 10, "Goodbye, Sheriff Taylor."
The party where Otis gets drunk and passes out on the jalopy he bought appears to be at a house across from a church, given the style of the windows in the building seen behind Andy and Barney as they're watching the house.