When ADV Films submitted the film to the MPAA, they were worried it would come back with a PG-13 rating. So if that did happen, they had a few extra changes of dialog with extra some stronger profanity in the script need be it.
The original subbed print of the film features Dr. Miesel saying to McDougall, "You Americans are so arrogant." Possibly in response to 9/11, the DVD changes the line to, "You are the product of arrogant minds."
Even though Spriggan is a Japanese movie, the theme song "Jing Ling" sung by Saju is in Mandarin Chinese.
Based on the Japanese Manga of the same name, "Spriggan." It ran for eleven volumes and was published in Japan by Shogakukan. Viz Media had licensed it but only published three volumes and changed the name to "Striker". However it did get a full publication run in Singapore by Chuang Yi Publishing.
Fatman and Little Boy are the names of the atomic bombs dropped on Hiroshima and Nagasaki.