Originally Posted by Teifiboi:
“I think that it's probably because they film in blocks, and that's probably driven, in part, by set location issues, but I suspect also by a desire not to have all the actors on set every day/week.”
I agree. Some of the bigger names will probably get paid more too, so they won't t want too many of them around at the same time unless it's s essential and they' re part of the story. They certainly won't t want actors hanging around any more than is necessary, just to be in the background of a scene or contribute a few words.