When Maggie sees Shelby off at the ferry and they hug closely, Maggie's left hand is below her right arm. After a cut, her hand is suddenly on her upper right arm, and back on Shelby's back again after another cut.
The movie takes place from just before Thanksgiving through Christmas Eve in Friday Harbor, an island in Washington State, but it was shot in Nova Scotia, Canada. Both locations are known for harsh Decembers, but this movie was obvious shot in early autumn: all around the town are lush green deciduous trees and bushes; only a few are yellow. It was also warm, so cast and extras didn't wear proper winter clothes either. Production didn't even bother to use artificial snow to at least hide green nature, which is obviously impossible in the December on those locations.
When Mark is driving his truck off the ferry, & right after, the bed posts are clearly two different heights. Once they are on the road, they are all the same height.
While supposedly on Friday Harbor, an island in Washington State, there is an announcement that the ferry is leaving for Bellingham (Washington). The ferry from Friday Harbor to the mainland goes to Anacortes, not Bellingham.