`` Night at the Museum : Battle of the Smithsonian '' reunites cast and director . Director says cast improvised much of the film . Movie is sequel to a 2006 film . Comment:
`` Night at the Museum : Battle of the Smithsonian '' reunites cast and director . Director says cast improvised much of the film . Movie is sequel to a 2006 film . Ben Stiller got into a slap fest with a pair of monkeys .