The episode title, "Les Lucioles", is French for fireflies.
Title: Krampus is the devilish companion to Saint Nicholas. There are several variations in the folklore but the idea of a dark or even black figure dealing with naughty children while Saint Nicholas brings treats for the children who have been nice is a common one. In Austria, Northern Italy and other parts of Europe, Krampus is celebrated on Krampusnacht, which takes place on the eve of St. Nicholas' Day. The Feast of St. Nicholas is celebrated on December 6, distinct from the modern Christmas celebration on December 25.
Goof: When Lisa takes off her bath towel, she has no shoes. When she runs naked outside, she is wearing shoes.