In Superman II (1980), the Kryptonians Zod, Ursa, and Non do not have superpowers while trapped in the Phantom Zone, but in this adventure Superman retains his.
Earth looks very different when Brainiac's meteor heads toward it.
In one scene, Lois Lane's eyes are black.
Brainiac changes in size through the movie. For example he becomes just as large to break through the street and in another shot he is just three times larger than Luthor's battle suit.