If you will look closely you will notice that the movie version of Eleanor is actually a 68. They called it a 67 in the movie and the one in the movie was a replica built for the movie (i"m sure there were more than one). But that is actually a 68 body style. The 68 has always been my favorite Mustang.
How can you tell the difference?
The only difference I ever knew of the two was that in 68, they had to put on the side markers, on ALL 1968 and newer vehicles.