When Kriminalassistent Mortensen falls over the bike, he loses the picture on the sidewalk. But two shots later he's holding it again in his hand
When Egon and Benny are arguing 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 hand break, you can see that the lorry is not rolling backwards, but in the next long shot, it is rolling, just as you hear Egon pulling the break, stopping the lorry.