Factual error: When Zapan speaks while his face is chopped off, the producers have failed to take into account the importance of mouth and tongue in producing speech. As a cyborg, Zapan could use speakers to produce a voice, but he isn't.
Factual error: Grewishka consistently survives falling several stories down. He is twice the size of a normal human. Assuming that he maintains the same density (weight to volume ratio), the fall must still be 8 times (2×2×2 times) harder. A scientific breakthrough that reduces density is perhaps not far-fetched in a work of sci-fi. But here, Grewishka's demonstration of brute force suggests that he actually has higher density, not lower.
