Song of the Thin Man confesses to both killings and pulls out a gun. An enraged Phyllis shoots him first, but her husband is only wounded. Then, despite Nick's pleas, she fires again and again, finishing the job. This "Thin Man" movie differs in several respects from the others in the series, and was one of two films in the series not directed by W. S. Van Dyke, who died in 1943. The script was one of three not written by the husband and wife team of Albert Hackett and Frances Goodrich, who had worked with Dashiell Hammett to develop the Nick and Nora characters
Thin Man (nuclear bomb) need to be accelerated to a speed of at least —or else the fission reaction would begin before the assembly was complete, blowing the device apart prematurely. Thin Man was long, with wide tail and nose assemblies, and a midsection. The length was necessary for the plutonium "bullet" to pick up adequate speed before reaching the "target". Weight was around for the final weapon model. There were no aircraft in the Allied inventory that could carry a Thin Man without being modified. However, the American Boeing B-29 Superfortress could be modified to carry it by removing part of the bulkhead