The music that plays throughout the game is actually "The Power of Love" sped up.
Contributed by retrolinkx
According to Bob Gale, co-creator of the Back to the Future series, the game's publisher "LJN" didn't want any input from the film's creators, however promised to show it to them when it was ready. Gale disagreed with what was shown to him and wanted it changed but was told that it was too late. Gale later told fans to not purchase it because of how bad it was.
Contributed by KnowledgeBase