The re-creation of Al's dream uses a few seconds of footage from Rejas humanas (1939), the earlier film version of this story; specifically the shot approaching the saloon, panning to see the policemen following the narrator, and panning back to the saloon side entrance.
Veronica Lake was considered for the female lead in this picture, according to an article in the 10 May 1948 edition of Daily Variety.
The play "Blind Alley", upon which this film is based, opened on Broadway in New York City at the Booth Theatre, 222 W. 45th St. on September 24, 1935 and ran for one hundred nineteen performances. It had a revival in 1940 that ran for sixty-two performances.
Al Walker is first seen with the kidnapped warden speeding along country roads in a 1942 Mercury Eight Town Sedan. Professor Linder drives a 1942 Mercury Eight Club Convertible.