When Character Arcs Hit the Reality Wall: Adapting to On-Set Derailments

Hey fellow writers, Nina here. I'm wrestling with a persistent problem in my latest feature script, a gritty character-driven drama. In theory, I've got this protagonist whose arc, built around his desire for redemption versus his need for self-preservation, feels rock solid on paper. Every scene, every beat, is designed to track his internal shift.

But I've been through enough productions to know that theory often evaporates the moment cameras roll. Budget cuts can axe crucial scenes, scheduling conflicts can force rewrites that compress or alter development, and sometimes, an actor's performance simply doesn't land the way you envisioned for a pivotal moment. The 'want' and 'need' can get completely lost.

I'm trying to preemptively 'bake in' some flexibility, but it feels like I'm just guessing. Has anyone experienced a situation where a meticulously planned character arc got completely derailed during production or post-production due to budgetary, scheduling, or performance reasons? More importantly, how did you adapt? What creative solutions did you find to salvage or re-route that arc while staying true to the core story? I'm eager for some real-world war stories and advice.