that's "The Gamble House" — built by the Gamble family of Proctor and Gamble. http://backtothefuture.wiki…

but it was in the past, so they knew each other in the future. see how that works?

I like to think they met in 1955 when Marty used Doc's time machine to go back in time

better idea for a film: how did disgraced nuclear physicist Emmet Brown become involved with high school flunkie Marty McFly?

zombies are fictional. so whatever you want to call the re-animated "monsters" / infected in the movie, they're modern-day zombies. by traditional standards, zombies can't run, but they also defy reality, so who cares.