When Egon and Benny argue about driving the lorry, Benny stops and refuses to drive any further. As they have stopped on a slope, the lorry starts rolling backwards, as seen in a long shot. In the close-up of Egon pulling the handbrake, it's obvious that the lorry isn't rolling backward, but in the next long shot, it is rolling as Egon audibly pulls the brake, stopping the lorry.