This is not directly related to the WGA strike, but: why is there always (?) the need for rewrites during shooting in TV and film? Is it because some other aspects are not defined before the script is done? Or does it happen to accommodate other ideas from other creatives (actors, directors, etc)? (Or neither?)

The second most common for me is being on set and hearing the lines said, and realising that a line doesn't work or land in the way I'd hoped, and changing it there and then, clearing it with the director and then going to the actor and saying, "instead of saying 'i don't know' could you say 'Nobody knows. Not even me.'?"

The most common is budget and shooting schedule. I wrote a 7 page scene in a graveyard which is a location an hour away, and we can shoot six pages in a day, so if I can lose a page from that scene we can get the location stuff out of the way in a day, otherwise we lose a full morning shooting one page because we have to relocate everyone after shooting. So either I need to lose that page or rewrite another scene to set it in the same graveyard.

You can lose locations and have to rewrite scenes -- the scene with Drunk Crowley seeing the disembodied Aziraphale was, in the shooting script set at night in St James' Park and had no alcohol in it. Aziraphale was a reflection in the water. A day or two before we were due to shoot it we found that we couldn't shoot in St James' Park at night and I was asked if we could relocate it to a cafe. But we couldn't find a cafe at short notice -- we could, however find a pub. So I rewrote it to occur in the day, with alcohol, in a pub.

Hello! So I was wondering about the filming of scenes, do you do them in chronological order, or do you do film them based on how important they are? Like with the scene when Crowly and Aziraphale swap appearances to fool the others, did you do that first because it was a dramatic moment or wait because it was one of the last scenes in the show?

Wherever we could, on Good Omens 2, we shot in chronological order, because it's easier on everyone that way. But we were also shooting in practical order. Which is to say, we needed to shoot what worked when, in terms of actor schedules and location availabilities and so on. So sometimes we might be shooting all the scenes set in, say, Hell, over a period of a week, wherever they occurred in the story.

Neil! :) How did you get that tall aerial shot of Hastur & Ligur at the very beginning of Good Omens?? A chopper???😅

That's a crane shot, achieved with something called a technocrane. There are also drone shots in Good Omens but that isn't one of them.