Revealing mistake: When Dirk and Al are struggling through the desert, chained to the trailer, they slip and fall into the pit. They coast down the slope, thud into a drift and fly through the air and land. However, in the next scene, their tracks are shown behind them as if they had not flown through the air at all.
Suggested correction: The bed of the truck flips over and lands on top of them. They didn't actually go flying through the air.
Other mistake: When the two heroes are wind riding the plane they more or less repaired (about 1 hour and 30 minutes from the beginning of the movie), the wind blows from the right side of the plane to the left, but the hero is counter balancing the plane on the left side as if the wind were coming from the left. He should be standing on the right side of the plane to really balance it.
Suggested correction: They are using the aileron and rudder to counter the effects of the wind and to provide forward momentum. The makeshift wing was placed on the right side of the roof meaning he would have to be floating in mid-air to be on the right side of the plane which is not feasible.
