Right before the scene where Jo and Bill lose their 2nd "Dorothy" they are approaching a tornado weather pattern, the camera zooms out and you see the Oklahoma flatlands, REALLY flat, the road is completely flat all the way to the horizon, than Bill radios the research truck and says some where along the lines of "I Don't See It, I Repeat, We Have A Non-Visual", They report back to him "It's gonna Pop Its Head right out from That Hill" the camera does another wide shot from outside and you see their truck and all the sudden this HUGE hill and other hills too, all the sudden it's like the Rockies! Where I come from, hills don't grow from the ground in 30 seconds, unless the car was traveling like 300 miles an hour.