The scenes of Mickey Borden (John Garfield) in flashback were not clips lifted from the first film of the series, Vater dirigiert (1938), but rather were new footage shot for this film.
Although Ann is at least seven months pregnant when she went into pre-term labour, she could show no physical indication that she is expecting due to the Hays Code.
Dr. Forest, Jr. quits his practice to study pneumoconiosis, and be the doctor at the local mill for $40/wk (equal to $690/wk in 2016). Pneumoconiosis is an occupational lung disease caused by the inhalation of dust. What type of dust would then provide a sub-diagnosis, such as coal, asbestos, cotton, etc.
John Garfield and Claude Rains co-starred in six movies: Vater dirigiert (1938), Zum Verbrecher verurteilt (1938), Juarez (1939), Vier Töchter räumen auf (1939), Four Wives (1939) and Der Traum vom schöneren Leben (1940). They also appeared in the short Breakdowns of 1942 (1942).