Peter Debruge Chief Film Critic “Perhaps if people talked less, animals would talk more,” observes one of the human characters in “Charlotte’s Web,” a kiddie classic that serves as both the butt of several jokes and an inspiration for Adam Sandler’s animated “Leo,” an endearing Netflix original that strikes just the right balance between heart and fart jokes. Basing the way Leo sounds on his squeaky-scratchy, slightly guttural impression of the late Hollywood agent Bernie Brillstein, Sandler voices a crusty old iguana who’s spent three-quarters of a century — practically his entire life — trapped in an elementary school classroom.