Continuity mistake: The cell phone photo that David snaps does not look like the one in the photo frame. Most obvious is the gap between Gabby and Angie's heads and the reduced size of the snowman's head behind them. Even if David snaps another photo, the snowman's head is the same size and distance behind them. (00:41:58)
Continuity mistake: Gabby's head is turned to her left. She turns to her right, but she is instantly back to her head turned to her left, as if she never turned her head. (01:22:57)
Revealing mistake: The stairs are a prop. About a dozen steep steps - just to the landing - are almost as high as the front door. (00:55:48)
Other mistake: Food products used for a snowman's eyes, nose, and mouth (olives, cucumber, and ketchup, respectively) do not stay intact or unchanged over a 1-2 day period, if at all. [The idea is too absurd to categorize as a "deliberate mistake."] (00:48:33 - 00:57:00)
