I also have to claim to not know for sure what you are supposed to do. However, I faced this issue when I wrote parts of my "Door Slams" stories.
In "After a Door Slams" I used a few lines of direct dialog and included this line along with the standard disclaimer:
The opening scene in this piece contains lines from the L&C episode Lucky Leon written by Chris Ruppenthal.
And in "The Evening After a Door Slams" I included this:
Portions of this work reference scenes from the L&C episode Lucky Leon written by Chris Ruppenthal.
I don't honestly know if that is good enough but it is what I did.
BobB
