Continuity mistake: His lazy eye is not consistently on his left or the right. It switches from scene to scene. Even though in the end he says it's his right eye people should always look at.
Continuity mistake: When Angus and Mr. Hunham are at the bowling alley, while playing a game, Angus looks to his left to see some girls giggling at him as he speaks with Mr. Hunham. In shots of Angus from in front, he has his arms to his sides, but when the camera cuts to the angle showing Angus looking at the girls, his arms are crossed. It cuts back and forth a couple of times from arms crossed to not.
Answer: Maybe since they didn't know how to get there, it would be easier than finding a map and trying to navigate there on their own in the snow? Just a guess, though.