Continuity mistake: When Klytus' ship arrives at the Hawkmen city, it is seen hovering in the sky. In the next shot, it is moving forwards, further away from the city and at a different angle. There is also no engine flare at the rear, which would signify movement. (01:14:00)
Continuity mistake: When Ming is impaled on the nose spike of the Imperial craft, the spike is perfectly horizontal. When he eases himself off the spike, it is pointing downwards much more.
Factual error: A meteorite falls onto Munson's bed, setting fire to it. He covers it up with blankets. But the meteorite is still red hot and would surely burn through, and set fire to his bed again.