When the tank trucks start on the trip, warnings are painted on the sides of the tanks. But, when they arrive at the new plant, the warnings are gone.
When Mitch approaches Carrie's car, she's sitting in the passenger seat. Cut to a closeup, and she's now behind the wheel.
When Mitch looks in his rear-view mirror to see Ken driving recklessly through the muddy water, the view in the mirror is from a static camera position, as the ground in the mirror is stationary.
When George shakes hands with Mitch at the end of the trip, his lips are moving but his voice is not heard.
When Frank tightens the cap to prevent the corrosive liquid from leaking out, he uses his bare hand which leads to severe burning, rather than simply using his shirt or scarf for protection. He easily could have used a wrench from the tool box his mechanic was using at the time.