"Screen Director's Playhouse" broadcast a 30 minute radio adaptation of the movie on December 9, 1949 with James Stewart reprising his film role.
"The Screen Guild Theater" broadcast a 30 minute radio adaptation of the movie on October 7, 1948 with James Stewart and Richard Conte reprising their film roles.
Thelma Ritter's role as the police captain's secretary was mostly deleted from the released print, but she can still briefly be seen and heard in one scene in which she tells James Stewart the captain will see him in his office.
Frank's name in real life was Joseph Majczek. After being released from prison in 1945, he worked as an insurance agent in Chicago. For his wrongful imprisonment, the State of Illinois awarded him $24,000, which Majczek gave to his mother Tillie. Majczek eventually remarried his wife with whom he had divorced while he was in prison. His last years were spent in a mental institution; he died in 1983.
The Chicago Daily Times merged with the Chicago Sun in 1948, the year this movie was released, and became known as the Chicago Sun-Times which is still in business as of 2011.
The man administering the polygraph test to convict Richard Conte was the actual inventor of the polygraph or lie detector machine, Leonarde Keeler. He plays himself in the movie.
The man imprisoned with Frank/Majczek, Tommy, whose name in real life was Theodore Marcinkiewicz, was released from prison in 1950, five years after Majczek. Marcinkiewicz was awarded $35,000 from the State of Illinois for his 17 years of imprisonment.