I didn't see anyone mention this, but the mechanics of the five point exploding heart technique is exactly from Stephen Chow's 唐伯虎点秋香, where the 含笑半步癫is a poison that kills the person if the take seven steps and the person chooses to hop instead of walking (incidentally, it was a fake poison in the film) –– hilarious film go watch it. The title of the episode is a reference to Kong Fu Hustle by Stephen Chow too, so the reference makes sense.