Blooper

When Destoroyah is dragging Godzilla across the airport runway, people move about in the terminal and a plane is even seen moving toward the runway.

In the opening sequence in Hong Kong, traffic is seen moving at a normal pace and in some instances is actually traveling directly towards the Nuclear Godzilla.

According to special effects director Kawakita, TOHO once again reduced the budget of the film, especially for the film's FX. This resulted in only 6 weeks to create all the different scale miniatures, and buildings reduced the actual shooting days to 73, and slashed the post-production time to only 3 weeks. This resulted in some shots being edited into the film in spite of them not being finished with composites. Among the shots are in the opening Hong Kong attack, where footage of panicking people was inserted in most, but not all the footage, resulting in one-shot having some rather unconcerned citizens visible on the bottom right frame.

In the wide shots, it is evident that the juvenile Destroyah monsters are actually just their movie tie-in toy figures being moved about.

When the small Destoroyah is blown up in the industrial building, it visibly disappears and is replaced by a badly superimposed explosion and a bunch of see-through pieces flying apart.