That’s simple enough. It’s true, high school can become such a foggy memory that passing a classmate on the street might not register any recollection right away. As Bob Gale explained to The Hollywood Reporter, Marty’s parents only hang out with Marty for six days of their lives, and for most of it, the time traveler is busy with Doc Brown trying to get back to his own time. Nevertheless, Calvin Klein does become instrumental in their love story. Bob Gale continued with this: