Other mistake: When Joey Lawrence gets his hand cut off by the human, he wakes up to find his arm where his hand used to be wrapped in some kind of black cloth. It's obviously his hand that is wrapped up because the wrap sticks out too far to be only wrapping his wrist. Plus it is also bulky which gives away the hand underneath.
Continuity mistake: When Joey Lawrence and the rest of the androids catch up to the run-away prisoner after Lawrence lets them go, they tell Joey to walk towards him. Each back shot of Joey he has his right arm in front of his chest. Every front shot both arms are at his sides. This happens the whole scene.