This episode is the first time Goober is referred to as "Goober Pyle." In Season 5, episode 23 "TV Or Not TV," Andy refers to Goober as "Goober Beasley."
When Andy walks into the Mayberry Diner to speak to George Jones, the boom mic shadow moves across the room.
George Jones says the treasure would be worth $100,000. Adjusted for inflation, $100,000 in 1967 would be worth $903,700.60 in 2023.
Although Andy dodges the question about who the fifth investor was, his ruse can only last temporally. In a town as small as Mayberry he's eventually going to have to come up with someone or something to account for that last $100.
Floyd wonders how many haircuts there are in the $100 he thinks he's about to lose. At the time that would be about 80.