When the family is arriving at the holiday house, you see Karen walk through the front entrance twice.
When Brad hands Dusty the cocoa, it's in a disposable cup. In the following scene, the cocoa is in a stainless reusable tumbler.
El Padre's shoulder wound changes to a wound on the upper arm once at the hospital.
The volume of eggnog in the bowl changes from one shot to the next.
Kurt tells Don that it is 85 degrees, and then Adrianna comes through to turn the dial up further. But when Don goes to turn it back down afterwards it is still at 85.
When Don first meets Kurt, Don mentions Kurt flew three missions on the Endeavour in 1994. This is not possible as the Endeavour space shuttle flew only two missions that year.
When Megan fires the shotgun, she holds it with the stock under her arm instead of resting against her shoulder. Firing it this way would cause severe injury.
Although it makes for a funny scene, snow throwers CAN'T create a disaster even close to what happens to Brad. The control of both the auger and the forward motion use a manual, NEVER automatic control. And said control must be gripped tightly to function otherwise it will release. This is to prevent the very catastrophe depicted here.
Showcase Cinemas does not sell bottled Coke products as shown during the "Feed the World" scene, they only have fountain sodas in Showcase branded cups, which are accurately shown in the film.
An AirBNB would not supply Christmas decorations.
Neither of the cars on the way to the AirBnB seems to be carrying baby Griffin; however, when you pay close attention to "One-Word-Story" sequence, you can see him in his child seat in the very right corner of the scene, sitting just behind Sara.
One of the kids tells Santa that they want "a shotgun with lots of bullets." Shotguns use shells, not bullets; however, a small child isn't expected to know the correct term for shotgun ammunition.
The movie theater restroom scene at 1:20, the urinals have no water supply to flush. The Sloan flushometer's water supply comes in from the opposite side of the flush handle. It appears that the tailpiece that supplies the water was taken off for this scene.
Player calls 8 ball corner pocket, but the angle changes and reveals the 8 ball still on the table.
The turkey hunting scene takes place weeks after the end of the fall hunting season.
When they are packing the cars to leave for the cabin, there is a row of forsythias in bloom at the edge of the yard. Not possible in December in Massachusetts.
The film takes place in modern day, and features a joke near the end making fun of Liam Neeson constantly making far-fetched action movies. Liam Neeson provided the voice over, and it is clearly his current voice, however the cardboard display in the lobby of the theater for some reason uses a photo of Liam Neeson that appears to be from 25 years ago.
At 51:58, the cameraman is visible on the bowling ball.
Dusty states that his father sent him to military school when he was 4. However, when he's 12 and goes to perform "Do They Know It's Christmas", he's not in a military school.