That's why in almost all cases screenwriters or source novel writers are strictly forbidden on set. The biggest problem are writer/directors who cannot deal wi

That's why in almost all cases screenwriters or source novel writers are strictly forbidden on set. The biggest problem are writer/directors who cannot deal with improvising actors. Like a Haneke, who would turn around in his grave if an actor goes against his sacred script. That's why they have 25 shots per scene, and 3-6 months per shoot.