Continuity mistake: In the scene where Nacho is supposed to beat up the guys on his date with the nun, he's stretching by the wall. He sees two guys coming and jumps over to grab her. When he first grabs her, her left arm is free, but in the close up shot directly afterwards, her arms are both inside his.
Continuity mistake: In the scene where Nacho is singing at the pro wrestler party and Esqueleto is being pulled into the hole by the fat lady, you see the fat woman knock down the plant pot in one shot. In the next, it is standing again, and then after one more shot, it is fallen over again.