This intelligent film about romance and justice, a blend of the serious and lighthearted, exemplified he trend toward ""social themed"" films that arose in the 40s, in such films asHow Green Was My Valley (1941),The Grapes of Wrath (1940),Mrs.In a similar camera movement (only reversed), when Willie steps up next to Mary on her father""s boat, the camera pans up and to the left to reveal Bill, Sr, shouting from his steering room toward his son to return to his own boat." After he heard the clicking beak of a thrush on the stone and saw the light of a crescent moon in the sky, the keyhole was illuminated in a halo of light.Directed by the talented Hungarian-accented Michael Curtiz and shot almost entirely on studio sets, the film moves quickly hrough a surprisingly tightly constructed plot, even though the script was written from day to day as the filming progressed and no one knew how the film would end - who would use the two exit visas? [Would Ilsa, Rick""s lover from a past romance in Paris, depart with him or leave with her husband Victor, the leader of the underground resistance movement?] And three weeks after shooting ended, producer Hal Wallis contributed the film""s famous final line - delivered on a fog-shrouded runway.