The trip length going from the downed tree to the house must have been a marathon in length but only during the trips in the middle of the movie.
First time: daytime; dad walks around the tree and suddenly the whole family is at the house, and it's still daytime.
Second and third times when the Realtor and dad go to leave, the scenes prior were early morning, just out of bed, and when they arrive at the area with the cars, it's night time.
4th time dad runs to the car easily in the same night.
5th time mom and daughter do it easily in the same night.
6th return trip to the house is quick for mom
7th mom carrying dad and that's quick too.
Where did Archie go?
Mom calls for Archie to get in the car, there's a bark but he isn't in the car at any following point.
When Jules spots the creature in the window, she only sees the top of its head, yet she describes it as having big claws and teeth, which she couldn't actually see.
The real estate agent's car mirrors the glow of spotlights used to lighten the area.