1975 was a year in the 20th century.
- Wednesday, April 30: The Vietnam War ended.
- Friday, October 24: The DeLorean Motor Company was founded.
- Wednesday, November 12: the clock at the Hill Valley Courthouse building had been stopped for 20 years. Twenty years after their first date, which had been "on the night of that big storm", George and Lorraine McFly had been together for two decades and had three children, ages 12, 9 and 7.