When the car with Alice is pushed over the edge, Alice wakes up when trees whip the sides of the car and she gets out. Later when Bruce looks over the edge at the car crashed and on fire, there are no trees on the hillside.
Around 1 hr and 10 minutes in to the movie, when Wolf emptied the bag to collect the money that is in the trunk of the car, the bag that should have just some brochures has some money in it.
It is highly unlikely that Alice would be able to walk barefoot on the bitumen road surface in the middle of the day in Australia.
The telescope the Webbs have in the living room by the window is a Newtonian reflector telescope, the kind with a mirror in the end of the tube. The way it is pointed it should be looking to the inside of the house, not outside the window.
The dental chair is set up for a left handed dentist, but Nathan the dentist is right handed.
Near the end of the film when Dylan and Alice drive away in the truck, you can clearly see three individuals riding in the front seat where there should only be two.
Swapping the x-rays in the dental records would not be enough, the dentist would have to rewrite the entire patient notes to match the dental work in the x-rays.