There's hardly a spark of life in this material, yet Zemeckis and his executive producer, Steven Spielberg, seem content to trivialize their own accomplishment. The fact that they shot the final two parts back-to-back was widely publicized. After viewing the final part, it's like they put more effort into saving as much money as possible, filming the two so close together, instead of putting effort into making a quality conclusion. Perhaps it might have worked if Zemeckis mixed up the present and the past more, injecting futuristic elements into the antiquated setting and turning the film into a delirious sci-fi hodgepodge. One of the few occasions he tries this sort of thing -- the flying hoverboard from Part 2 makes a crucial reappearance -- the results are amusing. But the only true surprise of this film is how lazy it all is.