The biggest effect the picture employs is a camera system called the VistaGlide. There are four scenes that use the effect of the same actor interacting with themselves. The four scenes that were shot were Griff and 2015 Biff in the Cafe 80's, the dinner sequence in 2015, 1955 Biff talking to 2015 Biff in the garage, and 1955 Doc talking with 1985 Doc. In order to create the dinner sequence with VistaGlide, the camera had to be divided into thirds and Michael had to come in three different times to play his older self, Marty Jr., and his daughter Marlene. This is the first film to accomplish interaction between the same actor on the screen twice as two different characters. If you watch closely, you'll see that 2015 Biff's hand disappears during the scene in the garage.

Film

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