The Simpsons: compare dialog to a frequency list --> show what's missing

Given multiple transcripts of Simpsons episodes and a frequency list of the English language, the task consists in the following (this is how I would do it, feel free to do it whatever way you see fit): 1. Turn the dialogs into a list of the unique words used. 2. Compare that list against the frequency list using computer software. 3. Show what the dialogs do not cover on the frequency list.