Steve breaks Oscar out of the hut during nighttime, yet bright sunshine is shown shining in through the window as they climb out through it, and the later shots of Steve and Oscar making their getaway are obviously filmed in broad daylight with blue sky. Then after the two are recaptured, the bad guy in the office remarks, "It'll be daylight soon."
The LTD's left front tire gets shot and goes flat instantly, yet in the scene of the car swerving to s stop, the tire is clearly whole and inflated.
The hole that Steve kicks in the blue truck's body-panel is a much different size/shape and is in a slightly lower spot when the truck arrives at the military base.
The runaway mine cars are travelling quite rapidly as they pass the miners, yet when Steve first grabs the end one, they are rolling very slowly; then when he starts jamming his feet into the track-ballast to stop the cars, they are going fast again.
The blue truck carrying the gold bars can be seen parked at a distance from the cargo plane, but at that time it still was on the highway on it's way to the air base.
The string of loaded mine cars is obviously very heavy, yet the loop of steel cable at the end of the towing-line is fairly slack, without much force being applied to it.
Steve takes a plane from Washington DC to Nevada, so he would not have had access to Oscar's blue Ford LTD sedan to drive it to the mine.