Giving feedback on writing can take insight and a certain talent of its own. If you are willing to take the time to compose a screenplay, it might also be worth letting people know the kind of feedback you need. Maybe you just want to track how the reader feels or is engaged or bored from scene to scene. You may want to know whether you are clear enough or whether your ambiguity or withholding of information engages curiosity or frustration.
You may know that a screenwriting circle you belong to tends to discuss only the broad strokes, so asking them to read a four page outline might help kick the tires on your story. Too many drafts that are not ready for feedback, full of typos, are submitted for premature feedback and it can hurt the writer’s image. A table reading where actors are determined to go through it cold may mean discovering speed bumps that could have been ironed out in advance. If one reader is busy checking text messages during the read and misses cues, a screenplay that relies on rhythm can lose its charm. Any gathering of people should be the chance to hear the script work. But another problem with table readings is that if the screenplay is so dialogue heavy it plays like a radio drama those listening will consider it a huge success but it will not be cinematic. It will be pictures of people talking. This doesn’t allow a cinema director much to work with.
Also, figure out how to break the news to prospective actors that you ideally plan to shoot what you wrote so that the writing is vindicated instead of replaced with paraphrasing or improvisation to placate cast members who want to avoid learning dialogue. It can be hellish to find out someone doesn’t get the stylized approach to your patter or a heightened language or they are just used to generating their own material and believe the written word to be arbitrary. They may feel vocal characteristics of actors are not enough to distinguish them and that what one character takes a few words to convey another should need half a page. Improvisation can take longer and may not inter-cut properly. For a low-budget film, straying from the script means having the ground shift under the feet of the director. And as common as it may be, a writer may have to fight for fidelity to the work and to avoid a committee sensibility.
Maybe the most commonly read draft or output of a script should not have everything in it. You might create a second document with embellishments that might have thrown some readers. I once forgot the word “pristine” for a cleaning lady’s hand and used as a place holder “perfectly white” and forgot to replace it. That may have been taken the wrong way by someone. I also had a domino effect after hearing someone’s long-delayed feedback that a couple of jokes were (in his mind) “punching down” and I could only reply, “You have to follow your own gut. No hard feelings if you don’t want to do the movie.” Some subjective and philosophical issues and interpretations have to be handled outside of the script. You either will allow someone else to decide what stays and what goes based on their sensitivity or you want the script to represent your own risks, tastes, and point of view. You might want to avoid what the Chinese call beizuo or the false virtue signalling that goes on so much in Western culture.