Originally the series was to be called "Voltaire" because of the name of the high school but it was finally named "Mixed" because it talks about the first mixed school in France at that time.
The series was filmed in Saint-Jean-d'Angély in France during Covid lockdown in 2020. The cast and crew took over many hotels and holiday gites (villas) that were not being filled by the usual tourists due to the pandemic. Each cast and crew member had to have a separate bathroom to use during their stay.