Having said this, Mr. Lazarus still advises writers to protect their works by either mailing a registered letter, establishing a copyright, or registering the work with the Writer's Guild. Screenwriters must submit works that look professional. Come to grip with the professional format for screenplays. The screenplay must be an appropriate length. Use a 12 point font.
Page numbers are essential.
Don't number scenes. The margins and the spacing should be correct. Formatting should be consistent, since it assists the reader. Don't do anything that stops the reader's eye. If you stop the reader's eye, you are going to have a problem.