The gargantuan Gorilla Galactabeast enters through tall trees of a mature forest on Terra Venture, calling into question the gargantuan effort that would have to be made to transplant an entire forest without harming it. (It would take many decades to grow from saplings.)
Titanisaur arises from Terra Venture's oceanic dome (with no explanation as to how it got there) to attack buildings in the city dome (without showing or explaining how it crawled through whatever relatively narrow apertures to get there).