"Expository scenes" refer to parts in a story or movie where information is provided to the audience, helping them understand the background, context, or important details of the plot. Full definition
When twenty minutes of expository scenes need to be tacked on in order to fill in necessary plot details of all we've seen before, it truly bogs down what should have been an otherwise exhilarating finale. (qwipster.net)
The long expository scene looks like the beginning of a downbeat, miserablist film whose only object is to tell the story of a married man attempting to recover from depression through rebuilding friendship and re-entering the world of work. (theguardian.com)
I'll also assume that Catherine Keener had more expository scenes filmed but were edited for time. (christylemire.com)