If you have points that are confusing, like having the entire cast come on at the same time, you are the stage manager, you can hold them, get the info you need and then move on. For a change like that you probably only need to know where they enter from and where then end up, which you could always as each person at a later time, there is no problem with that either. You are in charge, you can do what you ned to to get the information you need.