Jonah’s wife isn’t credited in anything on IMDb beyond 7×02 which is weird because they have things like unnamed protestor there. How reliable is IMDb??
I’m not exactly sure how IMDB works, but you’re right, a lot of extras were added way before the main cast was, and many of them were playing no name characters such as protester or reporter.
I’m assuming agents are the ones to add information. Maybe the lesser known actors and extras were looking to quickly add something to their resume. Having credentials to their name, especially a show like this one, makes booking jobs easier.
Not sure why Emily Pendergast is only listed for two episodes though, when she’s a recurring character.