I am suitably impressed by "Guilty Bystander."

Although Zachary Scott is supported by a solid cast of supporting actors, by Poverty Row standards, most of the other actors are confined to limited cameo roles. Scott is doing almost all of the heavy lifting by himself.

During the 1920s, the Barrymores were discussing their uncle, veteran stage actor, John Drew, Jr., while dressing backstage. Ethel asked "What was the last piece that Uncle John was in?" Lionel and John answered in reply "Mary Boland."