- Mitsuo Hirotsu
- technical supervisor
- Minoru Inuzuka
- dialogue coach
- Kisaku Itô
- technical art advisor (as Kisaku Itoh)
- Paul Nakaoka
- assistant to producer
- Kampo Yoshikawa
- technical advisor: Japan
- John Campbell
- publicist (uncredited)
- Ken Ishii
- technical advisor (uncredited)
- Tony Kuroda
- interpreter (uncredited)
- Joe Shinomiya
- interpreter (uncredited)
- Burt Steiner
- dialogue director: retakes (uncredited)