Goof :P
I just realised that they messed up the chronology of the song "Le tango des illusions”. The movie is set between 1958 and 1959.
Jacqueline Boyer won the Eurovision in 1960 and her first album was released the same year. Le tango des illusions was released for sure after 1962.
That’s of course it's something of no importance. The dancing scene and the song were both amazing. I can surely overlook any chronological order for a scene that I cannot stop watching.