This show aired March 21, 1970. The Apollo 11 mission and moon landing was July 16-24, 1969. The Apollo 12 mission and moon landing was November 14-24, 1969. The ill-fated Apollo 13 lunar mission lifted off April 11, 1970, three weeks after this episode aired on television.
Haney tries to sell the Douglases dirt dug up from the "Sea of Tranquil-lil-ity" on the moon and two "gen-u-wine" Mars rocks hurled at him by a flying saucer for just $87.
The vault full of Moon rocks kept at NASA all beep under artificial moonlight.
Johnny Whitaker is in his fourth of five seasons, co-starring as Jody, in the family sitcom Family Affair (1966) when he appears in this episode of Green Acres (1965). This is the second of two appearances he makes for the series. His first appearance, playing a different role, occurs in The Confrontation (1970) earlier in this same season.
The character Dinky Watson, played by Johnny Whitaker, is reminiscent of another character, Dilly Watkins, played by Christopher Shea in the 3rd-season episode How to Succeed in Television Without Really Trying (1968). Dilly like Dinky is quite the innovative inventor.