Factual error: Hannah's full name is Hannah Ásgeirsson. Icelandic surnames are based on the parent's first name, adding -sson for boys and -dottir for girls, so Ásgeirsson would be the surname of the male child of a man named Ásgeir. Her name should be Hannah Ásgeirdottir or Sigurbjörnsdóttir.
Trivia: A subtle reference to this film's 3D format: In Max's box, Trevor finds a pocket stereoscope, which are funky looking glasses that create the illusion of a three-dimensional image from two-dimensional photographs. It was invented by Sir Charles Wheatstone in 1840.
Answer: A mountain.