Lisa's Date with Density a child from Josh Weinstein's school days who everyday would get onto the bus with a piece of toast, which had Vaseline on it. A majority of the story is a reference to the film "Rebel Without a Cause". Lisa remarks that Nelson is "like a riddle wrapped in an enigma wrapped in a vest", a reference to "a riddle wrapped in a mystery inside an enigma"; this was Winston Churchill's opinion of Russia at the outbreak of the World War II. In its original broadcast, "Lisa's Date with Density" finished 63rd in ratings for the week of December 9–15,
The Riddle of the Sphinx (Inside No. 9) and just have there on every set." There is no particular significance to the hare itself. The hare is visible, though not clearly, in "The Riddle of the Sphinx" on a table in Squires's fireplace. There is also a "second" hare; though it is not visible in the partially completed crossword shown at the end of the episode, the crossword published in "The Guardian" contains a nina spelling "ONELEPUS", "Lepus" being the generic name for hares. Critics responded very positively to "The Riddle of the Sphinx", which was variously called a "brilliant episode" of "Inside No. 9", comfortably the best