Producer and actress Mylène Demongeot approached her Fantomas series partner Louis de Funès to complete the cast of the film but couldn't get him to accept because, considering himself as a more visual comedian, he felt he wouldn't fit with the humor of a script strongly based on puns.
Both Blanche and Dax had already died by the time this film was made.
Furax was not the thief in the original radio play.