Trivia

Ishirô Honda is said have been impressed with this film and reportedly sent screenwriter Niisan Takahashi a New Year's card congratulating him on a job well done.

While the Gamera films were made to be more childish than the Godzilla films, they were noticeably more violent. According to director Yuasa, showing bloodshed was a way of making the monsters more animistic and less anthropomorphized.

Writer Niisan Takahashi and director Noriaki Yuasa wanted to take the series in a new direction. Yuasa felt that the previous film had failed to be entertaining to children which is why he decided the protagonist should once again be a child. As Yuasa explained in an interview, "When I was young, after Japan had lost the war, the adults I looked up to suddenly went from being very militaristic to anti-militaristic. Because of this hypocrisy, I felt like I couldn't trust adults anymore, I hoped that when I grew up I would, in my way, still be like a child. I think this sentiment can be seen in my movies."

After the previous film had been given a larger budget, Daiei decided to reduce the budget for this film and brought back director Noriaki Yuasa, who was tasked in directing both the human drama and monster scenes.

This is the first film in which Gamera bleeds.