You're referring to the extended version of "Harry Potter and the Prisoner of Azkaban"!
A tiny but beloved book moment: a Daily Prophet article in the hospital wing mentions Neville visiting his parents at St. Mungo’s. The extended cut includes a of Neville reading this article, looking away with quiet sadness. It’s a brief nod, but for book fans, it’s a powerful connector to the later films. You're referring to the extended version of "Harry
More footage of the aftermath when Sirius slashes the Fat Lady’s portrait. The Firebolt Mystery: but for book fans