The movie starts with a stock NYC December footage. Then you see Theresa and young Katie inside Sheraton Vancouver Airport Hotel. They soon go out, and you can see a lot of beautiful green bushes, plants and deciduous trees with a bit of faux snow on the sidewalk. The movie jumps 20 years, and again the same scene at Sheraton Hotel and yet again outside of hotel just 5 days before Christmas, again a lot of green bushes, plants and deciduous trees. Furthermore, movie used a lot of December NYC stock footage, and almost every time after it there was a scene in city or in the front of Jack and Emma's house with a lot of green bushes, plants and deciduous trees. Of course, green trees in the mid of December in NYC is impossible, so movie was probably shot in September. And there is more - the final scene takes place in Romania on Christmas Day, and yet again in the town center there were a lot of green bushes, plants and deciduous trees just sprayed with faux snow.
