Coming six years before Pebbles and Bamm-Bamm had a cartoon series depicting them as teenagers, this episode offered the first glimpse of a futuristic version of the twosome, here as young adults.
Barney's estate in the dream sequence, Sandstone Simeon, is a play on the name San Simeon, California, and the mansion is possibly a parody of the Hearst Castle located there.
In the dream sequence, in Barney's mansion, there's 2 nude art pictures on the wall. Surprising that this made it past the censors in the 1960's.
Pebbles and Bamm-Bamm being married in Fred's dream would come to fruition in the animated movie I Yabba-Dabba Do! (1993).
The title refers to the story "Rip Van Winkle" written by Washington Irving and published in 1819.