In hindsight it might have been a good idea for authorities in Nice to alert the public that a film about the Nazis was being made in town.
On Monday passersby were left speechless when an enormous Nazi banner was draped over the Palais de la Prefecture, a government building in Nice's Old Town.
Another witness, Andrew Gentry, told the BBC that the scene was surreal.
“People started screaming… they were really agitated,” he said.
The film, entitled “Le sac de billes” (A Bag of Marbles), is based on the memoirs of Joseph Joffo who fled Nazi-occupied Paris as a child.
The Palais de la Prefecture in Nice was being used as a replacement for the nearby Hotel Excelsior, which was actually used as a spot to round up Jewish people before taking them to the death camps during the war.