Back To The Future isn't specifically referenced by name in the film, but interestingly that adds a new layer to the whole thing. It's established in the movie that Mark Hogancamp is a man who lost all of his memories following a savage beating at the hands of a group of Neo-Nazis, which possibly included memory of ever seeing Back To The Future. The artistic creations he makes with dolls, however, are in many ways representative of his surroundings and subconscious, so it made me wonder if perhaps the creation of the time machine was Mark thinking about the Zemeckis film without realizing it.