Factual error: The garage scientists are setting up an experiment. One of the guys goes to tighten the terminals of a battery. He grabs one in each hand and proceeds to tighten them. If he had done that to a real battery he would have gotten the shock of his life. (00:12:00)
Other mistake: One joint, already partially smoked by Bobby and Jonathan when Mrs. Glover enters the room, gets passed around a few times and lasts for an unusually long period of time. When it is already too small (barely big enough to be held), more hits are taken but the joint doesn't really get smaller. (00:12:42 - 00:17:03)
Continuity mistake: During the showdown's sword fight between Lansing and Faisal in the palace hall, there is a far-off shot in which the blade of Lansing's sword can just barely be seen bending off at an unnatural angle, revealing it as a prop. For the rest of the duel, the sword is shown intact. (01:16:44)
Continuity mistake: The left side of the open file folder is underneath the pillow and propped against the arm of the couch. After Beth has all of her papers/file folders on her lap, the open file folder is magically back in place under the pillow. (00:04:22 - 00:05:50)