Bart repeatedly asks Abigail (Patricia Breslin) if she knows Samantha Crawford. As this episode is a remake of The Dark Rider (1956) which first introduced the Samantha Crawford character, this is something of an inside joke.
The title is derived from the Yellow River (Hwang Ho in Chinese) which is the second-longest river in China and the sixth-longest in the world (3,395 miles) and flows west across across northern China and empties into the Bohai Sea.