|Source: creativescreenwriting.com/split/ : M. Night Shyamalan on the importance of outlining, using dark humor, the four genres of Split, and writing for different budgets.
Controlled expressions along with multiple, inter-persona conversations, and the typical Shyamalan tuning where people whisper more rather than talk aloud, make you wonder how this guy could have survived the outdoors or a neighborhood. McAvoy's character uses weird dance routines and eerie, underground, basement-like settings to further individualize each of his multiple personas with a very sombre surroundings. Not your outright gore movie, Split benefits from the passion of his many avatars – each one as twisted as any of its cousins, each sinfully-inclined, very realistic without the melodrama, rich with personality traits that are associated with a one-personality individual. Forget the disappointment of the Village and the likes and let us trust Shyamalan again for one more movie…one at a time!