Daigo was meant to return in movie, but Hiroshi Nagano had scheduling conflicts. Because of this, his son Tsubasa came into conception to replace him.
Mio Takaki, Akitoshi Ohtaki, Yukio Masuda: These actors from Ultraman: Tiga (1996) appear playing different characters (The Seer, the Leader of the Defenders and one of the Defenders, respectively).