I am the Chorus teacher at the school this was filmed

Ben Stiller's character is the chorus/drama teacher. His opening shot features him directing my students as his choir. Mr. Gribble is a bit over the top when it comes on producing musicals. He is a demanding teacher, and a bit full of himself.
Everyone that was involved with the production was super nice to the kids, very accomodating (they were in my hall for the entire 6+ weeks they were here), and were easy to work with.
Mr. Stiller was great to the students and several times "goofed" around with them.
From what I saw of the rehearsals, filming, sets, etc., it promises to be a unique, colorful, and (dry-humor) funny show.
My students had a fantastic time.