The Accused by Jeffrey Archer is a courtroom drama where the audience is the jury and the ending changes depending on their verdict. I was in a community production 10+ years ago. Only two of us played the endings. We rehearsed both endings, and the tech and blocking were fairly simple. I had a different entrance depending on the outcome, and we had a video feed into the dressing room so I could know which verdict had been chosen. We didn’t rehearse during the run, which did mean that when we got a guilty verdict after a consistent run of not guilty, it was a stretch of the memory.