What Could Have Been: The monster selection of the film was different. Originally, Maguma and Ebirah were to be in the film, and Maguma and Baragon were to act as guardians to the Kilaaks in fending off the SDF. However, due to the frail conditions of the suits owing to constant modifications and use in Ultraman, Anguirus, Gorosaurus, and Minya were substituted instead. Baragon did appear several times in the movie, but Maguma was cut altogether.
Varan was also supposed to play a larger role, but his suit was so decrepit from not being used for so long, that he only appeared in two scenes as a motionless plastic model.
King Kong was in early drafts of the film, but ended up getting cut as the expiration of Toho's license to use the character was coming too close to production time for comfort.