Plot hole: During the end of the film chase scene, Agent Mackelway calls Agent Kulok and gives her a vague location of where they are and asks for back up. Considering Mackelway had been kidnapped and driven out into the country, it should have taken Kulok much longer to arrive at the scene instead of the few minutes that are indicated.
Continuity mistake: In the car chase scene with Deunan and Hitomi, the chasing car crashes into a water melon sales stand. The car is splattered with water melon pieces and goo. The camera then cuts to Deunan and Hitomi and back, and the chasing car is clean again.
Visible crew/equipment: After Aeryn delivers the baby and asks John if he can get them out of there, in the shot after they kiss there's an explosion, and as the Charrid stuntman is thrown into the air we can see the springboard's top platform flip up, which propelled him into the air.
Continuity mistake: In the very beginning, just before impact, Walker goes out onto the balcony for a supposed security breach. Over the radio, the other officer refers to him as Sgt. Walker, but he, and others refer to him as Capt. Walker.
Continuity mistake: When Howl first flies with Young Sophie, he wears a ring on each hand. As they take off, one of the rings momentarily vanishes.
Continuity mistake: Simon gets groceries, carries them home in two bags, and is then in the hallway without any groceries. It is never clear that he sets them down. (01:20:35 - 01:21:40)
Continuity mistake: Right at the end, as Alex and Luke are about to have sex, Alex takes her hair out of her ponytail style and lets it hang down loosely. Her hair is extremely 'poofy' at this time, sort of messy as well. The camera angle changes to Luke for two seconds, then back to Alex. Suddenly, her hair is combed down and straight now...with no 'poofyness' and no hair out of place.
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)