Originally Posted by DENviaLAX

Agreed here. I think it'd be a bigger issue if the GA just skipped over the list entirely. But if they went down to upgrade #1 on the list into the last seat, it's unlikely they had the information with them for #2 and so on, because they weren't expecting to need it with only one seat left. So once they couldn't find that person, it likely wasn't worth the additional time needed to go back up, get the list, see where the next person was seated, walk back down, tell that person, have them move their stuff, etc. Especially if it was getting too close to departure time. All things considered, particularly it being a short domestic flight, I don't think it's a huge issue worth making a real fuss about.