- Dates unknown:
- Biff's mansion was completed, and Biff held a ceremony there. Lorraine Baines McFly was awarded "Mother of the Year for 1972", but Biff revealed that the ceremony was just a ruse to get Lorraine to show up to his mansion. Sam Baines was amazed at Biff's wealth, and told Lorraine that she could have married Biff if he hit him with his car instead of "that other kid".
- Biff Tannen's second wife left him when she found a fallout shelter full of statues and portraits of Lorraine underneath Biff's mansion. An IRS agent entered the fallout shelter and convinced Biff to create a corporation in order to benefit the Nixon administration, which would give the president deniability.