Honestly, I don't have the specific details. Maybe it's based on some local legend or a previously untold story. You could try looking it up on entertainment news websites or forums for a definite answer.
The Thing About Pam is based on true events. However, for entertainment purposes, some aspects might have been slightly fictionalized or exaggerated while still maintaining the core truth.
Hard to say for sure. Sometimes stories have elements of truth mixed with imagination. Maybe some parts of it are based on real life, but it's possible a lot is made up.