Continuity mistake: When Tim Allen and the bushman kid are in the city, they are sitting in the suburban, the sun visor in the car flips up and down between every scene.
Continuity mistake: When Michael is talking to Abe, and Abe is reading Patricia's letter, the position of Michael's arms changes between shots.
Continuity mistake: In the beginning of the movie, Mimisiku puts his hand on a burning hot coal to show that he is a man. He keeps it there for about 5 seconds and then takes it off. A burn like that should at least leave a scar or something but in the rest of the movie, his hand is fine and there is no burn.