Buta ga ita Kyoushitsu is a Japanese movie of 17,064 characters, with 1,207 unique words and 508 different kanji. Its difficulty rating on Jiten is easy, 1.9 out of 5. The full vocabulary list ranks all 1,207 words by how often they appear, and you can study them on Jiten or download them as an Anki deck.
Here are some of the words that appear most often in this media, as well as a sample of its rarer vocabulary.