When the family is decorating their Christmas tree Henrik is told that he can hang the first ornament. However, when he is shown hanging the ornament other ornaments are already hanging on the tree.
In Act I, Angie is going in the train to the Shepard's Ferry, her hometown. It's clearly snowing outside, and is cloudy. It's the same when the train start to slow down before stopping in her hometown, but once she gets out of the train and meets her dad, suddenly not only there is no more snowing, it's even sunny.
The movie takes place in the Connecticut, USA, in the mid of December, just before Christmas. However, it was shot obviously in the early autumn. You can see around Reynolds house and in the town center all those beautiful green deciduous trees, and bushes. They used a lot of artificial snow to mask it (artificial snow is completely different from the real one). However, they completely forgot to do that outside the Christmas Eve party building so you can see a lot of green trees and various plants without snow. Also, cast clothing was typical for early autumn, and not for mid December.
Tyler's trousers are too short when he is wearing a suit for Aunt Myrt's party.