"Supernatural" and urban legend(s)

Last night's episode of Supernatural claimed to have the most famous of urban legends, and in the preview you can tell that it's the "Hook" legend that they were going to use.

Except it wasn't. Not really. Aside from the use of a hook, most of the other stuff shown actually came from two other urban legends. One was somewhat similar in nature, since the beginning circumstances of both involved a teenage couple in their cars, necking.

The other was totally unrelated, while the writers had the characters saying that it's "right out of the hookman legend."

The variations are:

1. "The Hook" - the obvious one, since the episode was called "Hookman." A teenage couple was necking in a country road, and a "man" with a hook shows up.
   
   
2. "The Boyfriend's Death" - Rather than the couple escaping to find the hook attached to the door handle, the boyfriend goes out to investigate, and ends up dangling over the car.
   
   
3. "Aren't You Glad You Didn't Turn on the Light" - A few days later, the same girl goes back to her dorm to find her roommate already sleeping, so she didn't turn on the light. The next morning she finds her roommate dead, with the message scrawled on the wall.
   

As the show and the urban legends are all fiction, I guess there's not really much room for complaint, and one can easily argue that, if indeed these urban legends were rooted in real events, and perhaps of a supernatural origin, that they were all originally from the same root... but obviously the legends that have been passed on now are three separate stories.

I don't mind so much that they used three separate urban legends to have one origin villain, but I think it would have been much better to show the characters as knowing these are from three separate legends, rather than trying to glomp them all into one. These were characters who were supposed to know more about this stuff, after all.