Lupin steals the Mona Lisa by wrapping the canvas around his umbrella. The Mona Lisa is painted on a wood panel.
After Guerchard gets a description of the suspect and is told there are five hobnails in the right heel, he asks to look at the cast of the shoe. After looking at it briefly, he says he will take the cast of the footprint too. However, when he leaves, he takes only the cast of the footprint.