Saturday night in downtown Los Angeles brought all the stars of stage, screen, music, and sports for Game 3 of the Western Conference Semifinals between the Oklahoma City Thunder and the Los Angeles Lakers.  In a parade of power and influence, actor Leonardo DiCaprio sat along the baseline near the Thunder bench, flanked by friend and fellow actor Lukas Haas. To his left sat longtime actors Don Johnson and Noah Wyle, star of the hit HBO show “The Pitt.”  Industry executives and producers were well represented as well. Film producer Jeffrey Katzenberg exchanged pleasantries with legendary TV producer Dick Wolf. Across from them sat record producer Lou Adler, who was not joined by his friend Jack Nicholson, but instead his son, Ray Nicholson, star of the horror sequel “Smile 2.” Sign up for the California Morning Report newsletter California's top news, sports and entertainment delivered to your inbox every day. Thanks for signing up!…