Revealing mistake: When the semi trailer is coming at them sideways down the highway, the trailer is missing 4 wheels. The tandems do not have their inner dual tires on them. Perhaps this made it easier to slide the trailer sideways.
Other mistake: When Rusty is talking to the trucker on the C.B. radio, he hands the microphone to Kevin. Kevin never presses the talk button on the microphone when he is talking to the trucker.
Stone Crandall: You can make hot water come out of the cold faucet.