I only saw the Maxwell smart version; the tequila mockingbird. 
Didn’t we have a member here called Tequila Mockingbird?
You may very well be right on that!
Some of her early stories are being published for the first time as well as later nonfiction on October 21:
The Land of Sweet Forever combines Lee’s early short fiction and later nonfiction in a volume offering an unprecedented look at the development of her inimitable voice. Covering territory from the Alabama schoolyards of Lee’s youth to the luncheonettes and movie houses of midcentury Manhattan, The Land of Sweet Forever invites still-vital conversations about politics, equality, travel, love, fiction, art, the American South, and what it means to lead an engaged and creative life.
This collection comes with an introduction by Casey Cep, Harper Lee’s appointed biographer, which provides illuminating background for our reading of these stories and connects them both to Lee’s life and to her two novels.
A discussion:
It’s not quite “most of the book”, but the movie does have much less about the what’s going on with the children in the early part of the book.