The bedtime story that David Mars reads to Elfie towards the end of this episode is "The Nursery Alice" by Lewis Carroll. It is a shorter and simpler version of "Alice's Adventures in Wonderland", adapted by the author for "Children aged from Nought to Five", i.e., less than 5 years old. It was published in 1890, 25 years after the original "Alice", and it is meant to be read aloud.