Unlike its predecessors, the film did not receive a United States home media release until 2014, when it was released on Blu-ray along with the first two films. Its first US release was in 2003, when it was shown on the Syfy Channel in its English dub.
The Rainbow Mothra prop was accidentally destroyed during filming of the scene where the Primitive Mothras encase him in a cocoon. The thinner used to create the Primitive Mothras' silk ignited during filming and set the Rainbow Mothra prop on fire, requiring the filmmakers to retrieve a new prop and film the scene again with it.
King Ghidorah's roar is a modified roar of the creature that appeared in Godzilla vs. King Ghidorah (1991).
Cretaceous King Ghidorah's growls are reused for Orga's roar in the Japanese version of Godzilla 2000 : Millennium.
In this film, King Ghidorah became the first and so far only kaiju to make his debut in the Godzilla series and later appear in a film without Godzilla.