Character mistake: In her first walk through the city with Dr. Ido, after feeding the dog her sandwich, Alita takes a flyer and reads it. Between the lines that read "Wanted" and "Murder" there is a line in Spanish that says "Querido para el asesinato." It should say "Querido por el asesinato".
Other mistake: When Alita jumps on the table after breaking Zapan's nose, her right leg (left side of the camera) is missing. In the next shot, it reappears where it should be. (01:01:11)