The Godzilla design in the film's opening is based of the design of Godzilla in Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack (2001). When director Takashi Yamazaki eventually made Godzilla Minus One (2023), he cited Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack (2001) as his personal favorite Godzilla movie.
Godzilla has a cameo in this movie and 15 years later, Takashi Yamazaki would direct Godzilla Minus One (2023)