- Produced concurrently with Tonari no Totoro (1988). Many of the animators had trouble remembering which film they were animating.
- This is the only Ghibili theatrical feature film to not be part of the Disney-Tokuma deal.
- This film was initially distributed with Tonari no Totoro (1988) because it was the only way that Miyazaki could have been able to make "Totoro." The reason being that the original film pitch for that film was rejected, so they pitched a double feature with "Grave of the Fireflies," and the project was eventually backed financially by the original writer of the book on which "Grave" is based. It often was overlooked as a film because whenever "Totoro" was screened first, people were left happy and did not wish to be saddened by "Grave" afterward.
- In South Korea, the release of the movie was postponed indefinitely because of the concern that the movie somewhat justified Japan's role in World War II.
- The movie was originally intended as a sort-of double feature with another Ghibli movie, Tonari no Totoro (1988). Ghibli's parent company reasoned that Totoro's tie-in with a movie with more educational merit would guarantee its inclusion in the list of summer's recommended movies for school children.
- NTV in Japan produced a live-action version of "Grave of the Fireflies" in celebration of the 60th anniversary of the end of World War II. The made-for-TV movie Hotaru no haka (2005) (TV) began airing on November 1, 2005, at 21:00 Japanese time. Like the animated version, the movie focuses on two siblings and their struggle to survive the final days of the war in Kobe, Japan. However, unlike the animated version, the movie tells the story from the point of view of their aunt, and it deals with the issue of how a wartime environment could change a kind woman into a cold-blooded demon. That version stars the famous Japanese celebrity and actress Nanako Matsushima as the aunt.
- The fruit drops that Setsuko eats were made by the Sakuma Confectionary Company, which in real life was established in 1949 (four years after the events in this movie took place). A few years ago, Sakuma released limited edition tin cans that resembled the one seen in the movie. Some variations of these tins also had a picture of Setsuko looking through her tin for the last drop.
- Director Cameo: [Isao Takahata] The patient who comes in to see the doctor after Setsuko.
- From the start of production, director Isao Takahata wanted to cast appropriately aged children in the roles of Seita and Setsuko. Because the film takes place in Kobe, the search was limited to the Kansai region of Japan in order to find children who spoke the proper dialect. He was introduced to Ayano Shiraishi through a regional children's acting company, and he decided to cast her as Setsuko after only hearing two sentences: "My name is Ayano Shriraishi. I am five years old." He was later told by one of the company's leaders that they expected that Ayano was too young for the role, and so those were the only lines she had been instructed to recite in the audition.
- Isao Takahata was the only living animator involved on the project who had survived bomb blasts.
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: The film is based on a true story. Akiyuki Nosaka lost his little sister during the war to malnutrition and blamed himself for her death. He wrote "Hotaru no haka" ("A Grave of Fireflies") in 1967 to come to terms with the loss.
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