When a film cast includes names like Ben Stiller, Robin Williams and Owen Wilson, a bit of improvisation on set is to be expected. “I think the movie is really only 25 percent scripted, maybe even less than that,” said Shawn Levy, director of the new film “Night at the Museum: Battle of the Smithsonian,” which boasts those comedic actors and several others. “It just so happens that the scenes that get some of the biggest laughs are the improvised scenes, so it feels like more than that, but we had a very good script and it’s still very much there.” The sequel to 2006’s “Night at the Museum” welcomes back the trio and director as well as other original cast members, including British actor Ricky Gervais, while also adding fresh faces such as Hank Azaria (as a villainous pharaoh) and Amy Adams (as Amelia Earhart)
