Yes, script changes happen regularly on set. Don’t get so set on how a scene will play out. Sometimes things happen, sets and scenery changes. As an actor you should be flexible to changes and take direction from the director. At the end of the day, the director is responsible for how the scene is acted and blocked. Rarely, a director asks for input from the actor, but at the end of the day, we all want the best scene possible.

This is something to count on happening. Experienced department heads, cast, producers and director will be well versed in handling / adapting. The key is communication and distro —- give everyone a heads up ASAP esp cast, script, ADs, director are at the very top of that list.

Last minute changes can happen for various reasons and we need to be prepared to incorporate them seamlessly. That's why you should have the scriptwriter on location. She or he should be able to adapt to the changes and must work together with the director. Everyone should be on the same page including the Dop and the actors.

One thing I’ve found helpful is to take multiple stills of the scene as a visual reference , if you make changes involving props or wardrobe you’ll need these images to refer to when adding the new changes to ensure continuity.