Back To The Future's Most Annoying Plot Hole Has Nothing To Do With Time Travel

Many details in Back to the Future were thought through very carefully, with even the smallest moments throughout the trilogy worth notice due to the consideration put into them. These include little details, such as Doc wearing a bandanna in Back to the Future Part III made from a shirt he had previously worn to a "Smoking Required" sign in front of the Biff Tannen Museum in Part II.