After being rescued and eventually left stranded by local crazy, Jack Cracker John Carl Buechler , Marybeth follows Cracker's advice that he gave her before being thrown out of his house, to see Reverend Zombie Tony Todd to find out about a secret about her father that Cracker wasn't willing to tell her.
The cheesy stuff was incidental, and largely projected upon the movies years after their fashions and low-budget effects had gone out of vogue.
After she leaves, Zombie calls Justin, Shawn's brother, and reveals Shawn never returned with the boat.