The time circuit control microchip was manufactured there, although it is likely that it was heavily modified by Doc Brown. The 1955 version of Doc could not believe that the part originated from Japan, especially considering America had just defeated them in a war ten years prior. He considered the part a "piece of junk", and then became surprised when Marty McFly told him that in 1985, Japan made all the best stuff around.
- In actuality, starting around 1991 Japan entered a period of economic stagnation ("The Lost Decades") when its asset price bubble began to burst. As of 2012, the country still has not fully recovered from its early 1990s crash. This makes the common sci-fi convention of the time of Japan surpassing the US as a Superpower particularly ironic.
Behind the scenes
The auto manufacturing company Toyota also originated from Japan.
- Back to the Future Part III (Mentioned only)