There is a scene where they are driving in a convertible with the top down, and all of a sudden another camera shot shows the car with the top up. I don't really understand how they could miss this, it's very obvious!
What did the editors miss? It's a CONVERTIBLE! I suppose they also somehow missed the fact that in that scene there is a different driver (Carol is driving and Melvin's now in the back seat.)
Just a shot in the dark here, but maybe they put the top up when they switched drivers. Seems crazy, I know, but nonetheless possible.