Yet another entry in a long line of blockbusters for Pixar, Cars tells the story of a cocky race car named Lightning McQueen who learns there’s more to life than racing. Like a lot of Pixar pictures, it also presents a richly detailed world—this one entirely populated by cars and other vehicles. Kids who were mesmerized by the movie in 2006 are now old enough to notice its many other layers—including adult jokes, obscure references, and even some disturbing things about life in the Cars universe…