Towards the end of the movie, there is a banner in the town square that says the Christmas parade with be on December 24 at 10 am. However, the parade actually took place at night.
When Grace is making her World Famous Eggnog. From start to finish it is less than 2 minutes. It wouldn't be heated, the eggs would still be raw and the spices she just added wouldn't have had time to infuse in the mixture.
When Grace is trying to convince Ben over the phone to be Santa, she says "Once a Green River Hawk, always a Green River Hawk, right? Go Hawks!" Ben oddly replies with "That's really more of a crow." The disconnect is because Grace was supposed to make a "ka-kaw" bird sound at the end of her dialogue, but didn't.
After Grace finishes painting her picture, she throws a drape over to cover it. That drapery changes position several times during the next few scenes. This often happens when several takes are done for a scene and the final editing uses the various cuts with differing backgrounds.
Auto radio during the snow storm states I-95 closed between Hartford and Boston. I-95 does not go through Hartford.
After Grace and Ben said goodbye after the candlelight stroll, they Google each other. In that scene, Grace is sitting in a car while doing that. But that's really strange, because she doesn't have a car at her disposal. After all, her own car is in Boston, they have just agreed that she will drive back with Ben the next day to pick up her car.