The narration says Pennsylvania was named after William Penn. It was named after his father, Admiral William Penn, Sr. William, Jr. was given a land grant from Charles II as repayment of a crown debt to his father. However, as both father and son are named "William Penn", the narration is not incorrect, especially as the father had the name first.
In the list of cast members it's says Bemjamin Franklin next to Mandy Patinkin's name.