You might want to hold off blinking while watching the Entourage movie — you’ll miss a cameo. The 104-minute film is packed with at least 50 of them, from fan favorites who used to pop up on the show — Andrew Dice Clay is back, along with Bob Saget and Gary Busey. Wrangling that many celebs into one movie required flexibility. Kelsey Grammer’s walk-by in a scene outside the office of Ari Gold’s marriage counselor was scheduled at the last minute, when a hole in the star’s schedule opened. Many were arranged through well-placed connections: Warren Buffett, who in one scene randomly rides by on a studio golf cart, shares an agent with Ellin — CAA’s Michael Kives, who himself gets a cameo in a backlot scene. One dream request that failed to materialize was President Obama, who once told Politico he was a huge fan of the show.