Officer Harrison fires 14 rounds out of a six-shot revolver.
In the middle of the film there is a scene where immense amount of blood squirts on the windshield of the van. Marion uses the windshield wiper to get rid off it but on the next scenes one can see a totally clean windshield again.
When the party enters the General Store, Marion walks in completely naked. In the next shot, inside the store, we can clearly see him wearing striped boxers.