Other mistake: When Amanda's driver brings her to the cottage for the first time, he tells her he can't drive her up there because he would not be able to turn around, but the same driver picks her up at the cottage when she is leaving and presumably has no issue turning around at all, and you can see it's a flat field in front of the cottage.
Other mistake: When Buddy reaches inside the fuse box, after Finch puts snow in it. They cut right from him pulling it out to show his hands and there is a snowball in his hands. We do not see a snowball in the fuse box and he does not have time to shape one.