This television episode refers to:
February 4, 1940
Doug and Carrie are sleeping on the futon in the office while Doug's parents are visiting. They learned earlier in the day that Carrie is ovulating so the next 3 days are perfect for trying to get pregnant. Doug worries that the bed is too creaky, and his parents will hear them. Carrie tells him not to worry, but Doug says that once they start "doing stuff, it's going to sound like Geppetto's workshop in here."