It is more or less exactly what you would expect from a sequel to the surprise hit three years ago that found Ben Stiller’s nebbish night-watchman trapped in a museum in which all the exhibits magically come to life. It was an amusing concept then and still holds some charm now, although it also lends itself to bombastic overkill, which sequels are naturally inclined toward anyway. Although much of it is simply mechanical comedy and action, Amy Adams takes what could have been a silly one-note role as Amelia Earhart and turns it into something surprisingly sweet, funny, and earnest. (Cinemark IMAX, Dallas, TX)