if they weren't simply judging by who was in the photos, they would have known that Grayson Hall, Thayer David and John Karlen had actually begun work on the first day of shooting because both Julia and Stokes were part of the funeral and the scene with Willie outside the mausoleum was also shot that same day. And even Jonathan Frid began shooting a couple days later.
In anticipation of doing another shooting chart (for Scenes 121 through 140 in DC's script) in less than a week, I was just looking at the copy of the shooting schedule that I have and the photos that Flip included in their article make perfect sense given some the scenes that were shot during the first three days of production:
Day 1 - The funeral, Carolyn attacks Todd
Day 2 - David plays ball/knocked out, Carolyn returns
Day 3 - Todd stumbles through woods
And on a totally different front, I've also discovered quite interesting evidence in the shooting schedule regarding some of the recent material that's in the novelization but isn't in DC's script. You may or may not be surprised. But either way, that will all wait until I post the chart...