Other mistake: When the evil warlock breaks his way out of the condemned house, he uses explosives to escape, but for some odd reason, the door is the only thing affected by the explosion.
Audio problem: When the Droidekas start shooting at Yoda and Han, one of them shoot however the sound comes after the shot is fired. (00:16:05)
Audio problem: During the party at the end of the film, the hand clapping and dancing drifts out significantly out of time and sync with the music.