Play 'As Time Goes By'.
We're in the desert.
I did it because I wanted to.
When Laszlo makes enquiries, Signor Ferrari, an underworld figure and Rick's friendly business rival, divulges his suspicion that Rick has the letters of transit.
See Messianic Archetype just below.
La Marseillaise" is the French national anthem, But the Nazis largely occupied France in the early 1940s when the movie was made, and nobody played that song on German turf as it was banned: Vichy France, which technically ran Casablanca, used a song called "Maréchal Nous Voilà" as its anthem.
Ilsa is seen as somewhat manipulative and worse yet, unreliable.
Henreid did not get on well with his fellow actors; he considered Bogart "a mediocre actor"; Bergman called Henreid a "prima donna".