This film is one of my childhood favorites, and yet I still really enjoy it as an adult. I think the relationship between Fox and Lloyd is really what sells it. Lloyd does a fantastic job of portraying a crackpot inventor who despite his brilliance can never quite get anything to go off without a hitch. Fox, meanwhile, is that smart young man who seems a little too cool for school but somehow has befriended the brilliant doctor.
This film also contains a number of really great lines and exchanges between Fox and Lloyd, particularly in 1955 where Fox's 80s language makes little sense.
In the end this movie is great because it sets up the sequel in the very last scene. I'm not certain that the second and third films had already been written, but the movie still sets up the sequel to take us all the way to the year 2015!
Doc: Roads? Where we're going, we don't need roads.