At one point one of the boys brings French magazine "Pilote" which features part of the first "Asterix" comic story and the boys get the idea to scam people into thinking they invented the magic potion from "Asterix". Both "Asterix" and "Le petit Nicholas" where created by Rene Goscinny in 1959. The scam also mimics the scene from the very first Asterix story where Getafix the Druid and Asterix trick the Roman soldiers into thinking they drink the magic potion.
The enervated teacher who tries to get the kids to sing in a choir is played by Gérard Jugnot. He was Clément Mathieu in The Chorus (2004), a teacher who (successfully) starts a choir in a school for troubled boys.