post edited on July 28, 2022:
Starting at about 4:48 in this video, the detail I mentioned below gets pointed out!
21 years and who knows how many viewings later, I just now realized something new about Back to the Future with the help of the TiVo. I never noticed before that one of the consequences of Marty’s first trip back to 1955 was that Twin Pines Mall became Lone Pine Mall (as a result of Marty knocking down one of old man Peabody’s pine trees with the DeLorean). 🙂