After the player successfully gets 30 item pieces together, Doc Brown gets sent into the past and the year mentions that it's 1875. However, in the movie the year was actually 1885 that Doc Brown was stranded in.
In street 16 platform area in the year 1985 and 2015, there is a mall called "Twin Pines Mall". However in the Back to the Future film. Marty already ran over a pine tree at Peabody's farm in 1955 and altered the future and the mall is renamed "Lone Pine Mall"
When old Biff Tannen traveled to 1955 to give the sports almanac book to his younger self, he altered the 1985 timeline to the Biff empire Hill Valley where it's in ruins. Yet if Marty time travels to the year 2015. The futuristic buildings is somehow rebuilt including the Cafe 80s, Twin Pines Mall, Hill Valley High School, Texaco Gas Station, Lyon Estate Parkland, Drive in Theater, Town Square, Clock Tower taken back from Biff's ownership, or somehow the buildings in 2015 remains unaffected by Biff Tannens war zone of 1985.