I saw a lot of good things in that video. Jill and Derick worked well to get Izz to school, they were upbeat and seemed genuinely excited for this big event. Izz was happy and looking forward to the new experience. I'm sure that his parents talking about it beforehand, explaining what was going to happen, presenting it as a good thing, going to the school with them when they signed him up, all contributed to having a good experience.
Sam didn't really understand just what was happening, as a child of his age wouldn't, but he didn't appear to be upset at all. He'd been around when Izz was being prepped for school, and probably understood that his big brother was going to a place for a few hours a day, and it was a good thing. Big brother would come back again. Mom and Dad and Izzy were looking forward to it. He trusts that this is OK, so he's OK. He got Mom to himself for a time. The little bit of Jill's preschool seemed age appropriate and fun.
Both parents (and Sam) went to pick Izz up and Jill mentioned that they didn't expect such a long wait and also said that she wished she'd brought something along for Sam to amuse himself while they waited.
Izz seemed fine when he got in the car. Happy and confident, no sign that he'd had a bad day.
There are some things I would have done differently if I'd inhabited Jill's body at that time, but nothing major. I might have filmed the night before but not posted it, kept it for just the family. The morning wakeup gave me mixed feelings. I liked how Jill didn't say anything when Izz woke up and promptly laid back down again and didn't insist he get up RIGHT NOW. It was cute. The cut to Sam sleeping right through it was cute. But when Izz woke up and didn't look at Jill and didn't ask why he had a camera in his face or seemed annoyed with it? It's because he always has a freakin' camera in his face. Jill, that's too much videoing your kids.
But they didn't try to film other children at the school. One appeared in the background but was masked, so probably not a problem. Even the adults working there were wearing face masks and were filmed briefly and from a distance, and not forced to give an interview.
On the whole, a pretty good video of Isreal's first day of school.
Now Jill, on the issue of potty training Sam? Not necessary. Keep it off camera. Save it until later when you can casually announce that he's potty trained. Sure, talk privately among your family and friends about it, but the world at large shouldn't know about it. A few years from now you can talk about general stories about it, and don't specify which kid peed twice in the kitchen in the same spot on the same day. Even better if you, since you have a large number of strangers following you, say "This happened when someone I know was potty training their child, and this is how it was handled".
I could post about potty training issues online because I'm anonymous and there's very little chance someone could trace it back to me or my kids or my friends and family's kids. But you're right out there, and if you name the day something happened, and which child it happened to, it's a whole other issue. You're doing better than your parents and other reality show people have done. Just go a step further and emulate someone who is more private with the personal things.