Actually there are 7 distinct versions of Hill Valley across the 3 films. Three in the first film (1985A, 1955, and 1985B), two new ones in the second, (2015, and 1985C, with 1985B and 1955 repeated), and two in the last film (1885 and 1985D). Among other differences, only 1985A has Twin Pines Mall, and only 1985D has…