There are some major Harry Potter book to movie changes that longtime fans always point toward when discussing the iconic franchise and the changes made to the Dursley family are right near the top. Since the Dursleys don't appear in the actual Wizarding World side of the story, they aren't given nearly as much screen time in the films as the likes of the Hogwarts students and professors. Those who have only seen the movies are unaware of a lot about Vernon, Petunia, and Dudley.
