...appear on screen until the finale: Hoyt, Ms. Isabel, and Julie. Ms. Isabel wasn't even mentioned until this last episode.

That's a lot of character "reveals" for the finale. Besides Hoyt, I'm guessing that they've "showed" Isabel and possibly Julie at some point during the season as some other minor character. Like, is Isabel the reporter who they show following people around? Has Julie showed up as some other rando in the background that they maybe lingered a second or two longer on?