This was the last original episode broadcast on ABC.
In the opening scene, Judy "space-skis" to school. By 2022, sky-boarding, alternatively known as sky-surfing and sky-skiing, is a real thing. An airplane tows, on a fairly long rope, someone whose feet are secured to a wing-like airfoil.
According to this episode, The Flintstones (1960) was just a TV series within The Jetsons' universe and the characters were fictional. This would of course be retconned with the TV movie The Jetsons Meet the Flintstones (1987).