The actual Art Deco apartment building used in the film (located at 1360 Montgomery St in San Francisco) is still standing as of December, 2008. The actual apartment is marked by a cardboard cut-out of Humphrey Bogart, which can be seen from the street. The site is visited frequently by fans of vintage film noir.
Humphrey Bogart's complete uncovered face is not seen clearly until 62 minutes into the movie, when his character finally removes his bandages and looks into a mirror. All previous scenes with the character are either shown from his point of view or have his face obscured with shadows or bandages.
The playing on the phonograph of "I Guess I'll Have to Change My Plan" as Vincent is recuperating at Irene's apartment after his surgery may have been an arcane wink to the audience. It was used in "The Big Sleep." In that movie it was played when Vivian Rutledge (Bacall) pays off Marlowe (Bogart) at the gambling joint-nightclub.