Today's Random Question: Stage Door Traffic

Well, I don't stage door but I am curious how it works inside the theater. Is there a flowchart or list of who comes out when, or can anyone -- lead or ensemble -- come out and leave as soon as they're ready. I guess it's protocol for the stars to come out last...or is it? Are they last because they probably have more backstage visitors to entertain before leaving? Or is the stage door choreographed like a curtain call, ensemble first, then featured, then, building momentum and buzz, the leads? On a separate note, when Security says autographs and pics ok but no selfies, if an actor at the end offers or agrees to take selfies, does Security get ticked?

In my experience, this can vary widely depending on the show. When there are big stars involved (e.g., Jake Gyllenhaal, Glenn Close, etc.) or lead performers with whom the audience identifies strongly (e.g., Ben Platt, Lin Manuel-Miranda, etc.), it seems to often be protocol for the ensemble and smaller roles to come out first. This might be because the leads have more post-show duties and/or perhaps meet-and-greets (as has already been suggested here), or it might simply be a courtesy to the ensemble because the crowd tends to dwindle quickly after the principals have come and gone.

Also, performers in roles that require more makeup/wigs and/or complex costumes (e.g., The Phantom) tend to come out later simply because it takes them a lot longer to get out of all that.