Other mistake: At the very beginning of the movie, when the guy throws the match into the house, it doesn't enter through the window. The match crashes and bounces back, but the fire inside the house still occurs. (00:02:40)
Other mistake: The general, at the end of the movie, is covered in slime. First of all, no one else around him is. Second of all, he wasn't anywhere near it. Third of all, he had a tent over him. He was almost as covered as Orlando Jones was after he came out of "the hole." (01:34:11)
Other mistake: During the opening scene, basic explosive physics dictates that the car should have moved away from the meteor crash, not up and over it.
Other mistake: The puffy small burst explosions that occur within the cave do not exhibit how napalm would detonate, especially with the amount used, method they are detonating it and sheer scale of what they were looking to accomplish by destroying the alien habitat.