Other mistake: When Bastian and Atreyu gets to Xayide's castle, laser beams are are searching the ground for the intruders. Right before Bastian gets hit by the laser we see him running for Atreyu. Then we see light (obviously from a spotlight) being switched on and hitting the rock which Bastian jumps on. However we see the light from the spotlight move out of position as if the person controlling the spotlight thinks that Bastian will run further off the rock. When it cuts the light is back on Bastian and the rock.