Continuity mistake: The window frame is broken in different points throughout the episode. For instance, when Dio pops open the head of the constable, he lands on the frame completely devoid of any sharp part, while a moment before it had two wooden pieces sticking out.
Other mistake: During the fight, Dio seems to have the upper hand a first time when he bends JoJo's spear. In a Batman-like manoeuvre, Jojo disappears when Dio is facing the other way to finish his speech, but the weird part is that all the corpses are suddenly gone too.
