Other mistake: There is a wall mounted mailbox on the interior side of the deck wall, not easily accessible to a mail carrier. Wall mounted mailboxes are typically placed on or next to the front door or a more accessible location. The location of Richard's house would also question why a roadside mailbox was not required. (00:03:35)
Other mistake: On the way to the remote cabin in the mountains, the Jeep is driven through snow-covered roads and frequently has frosted windows. When the Jeep is approaching the "private" driveway/road, it has somehow been plowed (but is still snow-covered). Despite all the driving through snow and the windows usually frosted over, the Jeep looks clean and dry upon arrival and there is no snow on the tire treads. (00:22:32 - 00:23:21)
Other mistake: The cabin is cold and there is frost/condensation on the cabin windows that Grace is looking out of while watching the others ice-skating, but when she goes into the next room to say "See you later" to her dog Grady, the windows in that room are clear. (00:28:50)
Other mistake: Richard's remote "vacation" cabin in the mountains has a mailbox near the house at the top of the long driveway and the red flag is up for outgoing mail to be picked up by the USPS - but it is highly unlikely (almost impossible) that a mail truck would go there. Mail delivery trucks do not have to go to largely inaccessible locations or up long driveways to a mailbox where the truck would have to turn around or back down the driveway. (00:34:16)
Other mistake: When Grace goes outside chasing Aiden and Mia (who are attempting to get away in the Jeep), the amount of snow on the driveway is much lower than the surroundings, but no-one shovelled or plowed it. (01:37:50)
