Download the movie script and go through with it. You do not need to memorise the vocabulary, just go through it with some aid of using dictionary. I do not think, it is required to memorise the spelling of a word for this purpose.
Then, watch the film, again and again in reference to the script. Try it as many times as possible until you can repeat what they say in the film.
Do this the same for another film, and another film again. You will soon see the progress after you've done a few of them.