When the camera cuts to the baby's crib in the nursery the newborn is identified as Marybeth Campbell and the mother as Lori Woodward, which is her maiden name. Earlier in the movie when Lori is calling the hospice she identifies herself as Lori Campbell.
When Julie Andrews' character wheels the baby (James Garner's character's new-born grand-daughter) in to the mother's room for a feed, the crib on the trolley is empty in the first shot filmed from inside the room as she enters.
When the two sisters are preparing Thanksgiving dinner, the older sister, Lori, asks the younger sister, Jaclyn, to "mash these potatoes". Jaclyn begins mashing already mashed potatoes.
When James Garner breaks into the cabin, it takes him only a couple of seconds to get to the front door and open it for Julie Andrews. It should have taken a lot more time, as he would have had to climb into the broken window and cross the floor. He also says that he has checked the phone and found it was dead. He simply would not have had the time to have done that.
The road down which James Garner and Julie Andrews ride on the tractor obviously has been plowed, even though Garner says that it hasn't been. Also, the tractor was free of snow; and in that blizzard, it should have been half-covered when they found it. The amount of snow on the ground is the ultimate unreality, as it would have taken hours for that much snow to have fallen and to drift that much.
When the character of James Garner is in the car outside the restaurant and gets the call about his wife's heart attack, the Quebec flag can be seen in the reflection of the car window, but the movie is supposed to take place in the US (although it was filmed in Montreal, Quebec).