As they watch The Donna Reed Show, Lorelai and Rory make up their own snarky dialogue to accompany the episode. This is highly suggestive of the American comedy television series Mystery Science Theater 3000, which originally ran from 1988 to 1999.
The premise of the show is that the host has been kidnapped by mad scientists and imprisoned on a space ship to watch bad movies until it drives him crazy. To keep his sanity, the host builds sentient robots to act as his companions, and makes sarcastic comments on the film he is forced to watch. This may be one of the inspirations for Lorelai and Rory’s behaviour.
The Annotated Gilmore Girls 
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