Someone is hit from behind by a snowscooter, but the only consequence is that it scoops him up so that he winds up sitting on it for the rest of the ride.
Not really, but one of the characters is notoriously anxious about everything, sometimes more so than other times, and expresses it many times throughout the movie.
Twice, a character drinks from a glass of some sort of what seems to be alcohol (judging by the line "Did you dip into this one?" at one point when someone says something that sounds crazy), and buying aquavit for Christmas is mentioned; that's all.
A character thinks that someone invisible may be a ghost, because they see the invisible character's hat seemingly flying around on its own etc.. But no, there are no ghosts.