Conversation so far:
What factor decided the casting for the Simpsons Movie?
For inspiration the for crowd scenes in the Simpsons Movie, the production staff referenced a poster featuring more than 320 Simpsons characters, trying to include every character in the film
Are there any other interesting aspects about the Simpsons Movie besides production staff referencing a poster with more than 320 Simpsons characters?
The Simpsons Movie cast did the first of three table readings in May 2005, and began recording every week from June 2006 until the end of production.

Question: when was the end of production?
Self-contained rewrite: When was the end of production of the Simpsons Movie?