Paul Henreid's act of lighting two cigarettes at once caught the public's imagination, and he couldn't go anywhere without being accosted by women begging him to light cigarettes for them.
The movie's line "Oh, Jerry, don't let's ask for the moon. We have the stars." was voted as the #46 movie quote by the American Film Institute (out of 100).
Filming went a few weeks over schedule, which in turn caused some conflicts with Casablanca (1942), which also starred Claude Rains and Paul Henreid. Rains finished work on this movie on June 3rd in 1942 and did his first scene on Casablanca (1942) at 10:30 the next morning.
On-set observers reported that Bette Davis often seemed to be directing the film for Irving Rapper. Unlike others she had worked with, his approach to her was much more conciliatory. Rather than order her to play a scene a certain way, he would ask her to try his ideas to see if they would work for her.