SHAQ, the four-part HBO documentary whose final episode airs on Dec. 14, offers occasional points of revelation from Shaquille O’Neal. One of the most dominant players in NBA history, O’Neal has also been a ubiquitous presence in our cultural lives, given his role in TNT’s wildly popular and influential Inside the NBA studio show and appearances in about a million commercials (for General Insurance, IcyHot, Buick, Hulu, Pepsi, and on and on and on).