Pierre Renoir took over the role of Jéricho (an informer) after the actor Robert Le Vigan was arrested for being a Nazi collaborator. One of his scenes survives late in the film.
A large number of members of the French Resistance worked on this film's crew, as Nazi power was at its peak in France and these fighters needed concealing.
The name of the female lead, Garance, is the French word for the flowering plant known as madder in English, from which comes the scarlet pigment.
The name of the theatre, Funambules, translates to Tightrope in English.
Screenwriter Jacques Prévert wrote the character of Nathalie (originally called Thérèse) for actress Marie Déa.
18 months in production.
This involved building the largest studio set in the then history of French cinema - the quarter mile of street frontage, reproduced in scrupulous detail, representing the Boulevard du Crime, the theater district of Paris in the 1830s and 40s. This would have been a daunting prospect at the best of times but in Vichy France, when all artisans, transport, materials, costumes and film stock were all in short supply, it was a miraculous achievement.
When Italy fell to the Nazis, the Italian co-producers left the project, causing a financial vacuum.
The original French producer had to withdraw when he came under investigation from the Nazis.
Production designer Alexandre Trauner and composer Joseph Kosma -- both Jews -- had to work in hiding and submit their ideas via intermediaries.
Turning was ended a short time before the D-Day and the director, having planned to distribute the film after the liberation of France, had three copies printed and concealed in three different places: a cellar of the Banque de France, a strongbox of Pathé and a Provence country house.
Distributed in USA as a sort of French made "Gone with the wind".