Richard Bull " Little House on the Prairie " is credited as history teacher Bill Lindsay. The role was actually played by actor Sandy Kenyon.
When Andy presses Floyd to talk to Goober about how much of a pest he's become, the gentle barber complains that it is a hard thing to tell a friend he's a blabbermouth. Although it can mean overly talkative, blabbermouth is usually a term applied to talking indiscreetly; a gossip who reveals others' secrets. Goober's transformation is really much closer to his having become a know-it-all rather than a blabbermouth.
Goober says that Hawaii was the 49th state and Alaska the 50th. It's actually the other way around.