In the original BTTF, Claudia Wells played Jennifer, Marty McFly’s girlfriend. However, when it came to filming the sequels, Claudia had (temporarily) retired from acting to care for her sick mother and she was replaced by Elisabeth Shue.

Now, whether you prefer one or the other is a matter of personal preference (*cough* Claudia *cough*) but what’s fascinating is to see the way Robert Zemeckis and his team recreated the end of the first movie for the beginning of the second, with everything exactly the same except the new Jennifer.

Everything, that is, apart from Christopher Lloyd’s performance as Doc Brown. Either he decided to make some alternate choices in the way he delivered his lines, or he’d forgotten how he did them first time around and couldn’t be bothered to check. You decide.