Moral for Urban Legend: Gramma learned it's wrong to scare people and ruin her family's fun.
Moral for Wishing Well: Cricket learned it's wrong to scam.
Bill and Gramma have non-speaking roles in "Wishing Well".
Coincidentally, both episodes feature a character (Gramma and Cricket) doing something that is considered wrong, and in the end realize their mistake and resolve it.
As far as Cricket's shoulder angel and devil are concerned, they seem to have the ability to interact with the environment, as opposed to traditional when they only appear in the mind of the person alone.