Level Louie's Bar is apparently in the 500 block of South Main Street, as the Gayety Theatre @ 523 South Main is directly across the street, thanks to a rear projection visible in several shots. The names of Randolph Scott and Don Ameche appear on the marquee; it was the Gayety's policy of listing the players rather than the titles of the films, on their readerboard.
The second film in which John Ireland and Mercedes McCambridge appeared together. The other was All the King's Men (1949).
"Night is the mother of thoughts." is a quotation from John Florio (1553 - 1625), an English writer.
The line, "The lone and level sands stretch far away", is a quote from 'Ozymandias' by Percy Bysshe Shelley.