"The Screen Guild Theater" broadcast a 30 minute radio adaptation of the movie on July 5, 1943 with Ruth Hussey and Lionel Barrymore reprising their film roles.
Van Heflin suffered from appendicitis during filming. The production filmed around him and his illness did not cause a delay in production.
Although "William Wright" is in the cast list playing the Alderman, the actor was actually Will Wright, who often used "William Wright" for his name when uncredited.
Early production charts and a newspaper item included Lewis Stone and Grant Mitchell in the cast, but they were not in the film. Porter Hall (The Weasel) and Sheldon Leonard (Atzerodt) were in the Call Bureau Cast Service list for those roles, but they were cut for the released print. Similarly, Lew Short, Ralph McCullough, Al Ferguson, Ben Hall, Roger Gray and Murdock MacQuarrie, all listed as "Men at Railroad Station" must have been cut, since there were no railroad station scenes. Also Joseph E. Bernard (Engineer) and Jack Daley, Stanley Price, Philo McCullough, Frank O'Connor and Bob Ryan (I) listed as "Men at Another Railroad Station" must have been cut for the same reason. Also Allen Pomeroy and
Film debut of Jim Davis.
There was a protest from some sectors that the film distorted the life of Thaddeus Stevens (who initiated the impeachment proceedings against President Andrew Johnson). Additional filming occurred in October 1942, but it is not known if it was because of these protests. One line in the script (Stevens referring to Lincoln as "the old ape") was eliminated. Still, the film treats Johnson much more favorably than it does Stevens.