- Edited for Syndication: The television cut by UPA, which was chosen for the Classic Media DVD release as the included english version. While not Bowdlerized to the same extent as the theatrical release (there's a shot of Katsura's bare breasts that was edited out, and nothing else), this version also adds a bizarre prologue with narration recapping the past Godzilla films over stock footage of the other two Godzilla films UPA had the rights to (Invasion of Astro-Monster and All Monsters Attack. Since the latter was itself a Stock Footage-filled movie, this meant they were also using footage from Ebirah, Horror of the Deep and Son of Godzilla).
- Enforced Method Acting, Throw It In!: During the climactic battle, one of the explosions sets Godzilla's spikes on fire. The actor in the suit (Toru Kawai) is visibly freaking out, even through a hundred pounds of foam rubber.
- Refitted for Sequel: Some of the elements in this film may have been used from the original concept of the original Godzilla (1954): An old scientist discovers an undiscovered ancient beast near Japan, reveals to be a Mad Scientist, sabotage the military's efforts to defeat the rampaging creature, and his daughter thwarting his plans as this is going on.
- Word of God: Series creator Tomoyuki Tanaka in his Godzilla fact books stated Titanosaurus did indeed survive getting blasted off the cliff by Godzilla in the end. Now free of the mind control, the dinosaur went back to peacefully living in the ocean depths.
Trivia / Terror of Mechagodzilla